I have some SOL and sometimes use the Solana network, because currently, there are many exchanges, and almost all top exchanges provide the Solana network option for transfers or sending. So, if for example when checking the fee is quite low, then usually use that. Yes, between if not Solana then BSC network.
It's just that if say the most frequent, it's still the BSC network if it's between exchanges. But if on DEX, Solana network is more often. Yes, actually it's our own preference. Because both of them also have very affordable fees and are equally fast. Maybe it's just because of how they are used to it.