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I don't have a solid answer for you, but can provide a bit of help explaining L2s and some of the confusing crypto terminology.
ERC20 and TRC20 are the token standards for Ethereum and Tron respectively. The same way HTML is the standard format (or language) used by websites. Having a shared sandard for all tokens is what makes them act the same. Otherwise ERC20 and TRC20 have little to do with either network (meaning you store your tokens on the blockchain and not in the format being used).
Binance calls these blockchains by their token standards for bad reasons, not worth getting into here.
L2s are Layer-2 networks, usually referring to Ethereum's L2 networks (as Ethereum is L2-centric, and puts a focus on utilizing L2s for scaling). You can think of L2s as sub-blockchains that exist inside of its parent-blockchain, if the L1 goes offline then no L2 can work either.
When you create an L1 (aka mainnet) transaction the data is computed and stored by millions of node independantly within the network, which uses up a lot of finite compute resources and therefore money. Gas fees = compute and storage. When you process an L2 transaction, the L2-chain computes it alone (or as part of a smaller network) then bundles the already-computed state with thousands of other transactions and uploads it to mainnet as 1-transaction (instead of 1000s of seperate transactions full of redundant compute and storage). L2s reduce your gas fees drastically because now the L1 only needs to store your data and not compute it.
Over simplified, an L1 transaction might look something like Bob sends Alice 5 USDT. To compute this you need to look at Bob's balance, the USDT code, the USDT balance (ledger), and Alice's balance, preform a bunch of math at each step, then finally update the final L1 state to reflect Bob -5 and Alice +5. An L2 will send only the final state of Bob -5 Alice +5 to the L1, of course using layers of cryptography and to ensure fraud can't take place.
As an end-user, since the type of cryptography is the same between a L1 and L2, you simply need to change your Ethereum wallet from Mainnet to the L2 network of your choice and you're able to use the same wallet address to send/receive crypto assets the exact same way you'd use the L1. Very similiar to using Ethereum-forks like the Binance-chain (BNB). Your wallet's balance is independent of each network, however, meaning if you have 5 USDT on L1 you will see 0 USDT on L2 unless you move (aka bridge) the USDT to that specific L2 network - at least at this time (it's a work in progress).
It can be costly to bridge from L1 to L2, requiring tons of compute, but it's cheap to go the other way around. Ideally everyone uses L2 for day to day transactions, using exchanges that support the L2 to allow them to avoid the L1 and its fees entirely. Exchange to L2, L2 to exchange.
Binance supports several of Ethereum's major L2's including Optimism, Arbitrum, and Base. USDT is also on all of these networks. If the 3rd party service you're using to spend your crypto does not support an L2 then you will be stuck paying L1 fees anyway once you bridge L2 to L1 and send it over to the service. If the 3rd party service DOES support an L2, it is absolutely worth experimenting with small amounts to see how it all works considering L2 gas fees can be as low as $0.001, even $1 in ETH for gas will go a long way.
Gas fees scale with usage. With more people using up Ethereum's limited blockspace the fees required to make a transaction go higher, like every blockchain, to avoid spam and because block-builders are always incentivized to make the most money for themselves. Tron avoids this by being much more centralized than Ethereum with a far larger blockspace, so less work is required to do the same thing (which isn't good regarding security).
Right now is sort of a lull in crypto where not as many people are doing that much so fees everywhere are low. But in the past there have been events that sent Ethereum's L1 fees to $10-50 and beyond (especially for more complex smart contract interactions, like sending USDT, like $100+ fees). It would suck to put yourself in a position where you have $50 and the fee to do anything with it cost $49 is what I'm getting at. This makes it difficult to make assumptions about Ethereum vs Tron fees in the future even if they're the same today. L2s are an exception as they can scale much beyond any L1 without sacrificing security.
Basically your best use-case (lowest fees spent) depends on whether Redotpay supports an L2 or not. The rest likely comes down to personal preference. Hope this helps.

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