Hi ps99115,
If by “surface feel” you mean which one would feel softer with very slight pressure then it would would depend on the specific type and blend and ILD of the latex in the top 2" layer but I would also keep in mind that a mattress that has a softer “surface feel” can still feel firmer overall when you sleep on it depending on how much you sink into the mattress and on which type of firmness you are most sensitive to (see post #15 here)
Phoenix