比较差价合约敞口与直接期货（$ES等）

For me, it's less about the size and more about the holding period. Anything I anticipate holding for more than a few days, I'd rather take the direct futures route to avoid those overnight CFD financing charges.

I made the switch to direct futures ($ES_F) once my typical position size exceeded a mini-lot. The funding costs on CFDs really eat into profits on longer holds, and the liquidity in futures is just unmatched.