Raid Suit. Afterall, it doesn't have a side effect.
But it's not the only reason. Enma sure boosts your destruction capacity way more than what the Raid Suit would give. BUT Raid Suit is MORE BALANCED in its own boost on top of the versatilities of the boosts it provides as well as NO side effect.
Meaning:
Enma's power up: Greater attack power (but huge side effect with haki similar to Gear 4th)
Raid Said power ups:
1- Greater attack power (not as destructive boost as Enma, but still, it increases this area) But generally attack power increased by toughness of the suit as well as the boots have engine like air which will increase power of kicking (Look at Judge kicking Sanji moment to understand what I'm saying)
2- MUCH Greater Durability
3- BIGGER Boost in flight than regular moonwalk/skywalk. It really provides floating, which in combination with skywalk would give great speed in air.
4- Greater Speed in general because of the soles of the boots.
5- On top of all of that, the icing on the cake is to become invisible!
I mean, only a bias person would claim Enma provides more power up than Raid Suit given what was shown so far.
It's no secret Sanji was falling behind Zoro and the gap was getting wider and wider. So, Sanji needed a bigger buff than Zoro's buff. So, it makes sense. Now, they are back to where they are used to be again, which is great