27 Moesly Seamaster Flybridge Power

[3rdday]

I have been soliciting opinions on twin power for my 27.
Contemplating twin 250 OX666 or twin 200 OX66.
Talked with an owner who had twin 250 said it was a rocket and tops out at 55mph.
I don't want a rocket I want economy. Wondering if 200s will burn less or more fuel because of the power to weight ratios (overall weight of vessel)
I will troll allot with the boat so I don't want to feed big engines fuel.