Use Bep20. These days, TRC20 network is more congested and charges more fee than Bep20. I also think the BSC network is faster than TRON network cos I've been using both and I've been getting faster Bep20 transactions.
agreed with this tron nowaday have quite many people that used it even fee in various exchange increasing nowadays it usually charges $2 if im not mistaken meanwhile BSC $1 max for many exchanges, if we are talking about stablecoin of course, but anyway exchange doesn't really care what asset we are moving anyway they'd charge sending native token or stablecoin the same.
so I agreed in this regard BSC is better.
the good thing with BSC that people sweep under the rug is probably that many of its dapps feels really familiar with the one in ethereum maybe thats just me though but I think its a good thing to have.
overall if i have the chance i will always choose BSC over tron any days.