My 18’ Smokercraft is a wonderful boat, works awsome for everything I do with it. The only exception is she’s a bit sluggish to pop out of the water when I have 3 or 4 people in it, which is only about 10% of the time, and will porpoise a bit if there’s a lot of weight at the back ( humans). I run a Suzuki DF140 and the prop is set perfect for wot and top speed, so that’s not the issue. I’m looking at trying a hydrofoil for that little extra assistance, and just wondered what anyone else is using or has used in the past. 

I have used a SE 400 on a few boats and its always worked well. I like it because it's no drill.

Don't know there is a "BEST" they all do the job, just some do it differently than others.

With that said, the only one I would run is the SE Sport.  I run the 300, they didn't make a 400 10 years ago when I got mine so don't know anything about the 400.  I like the looks and performance of the SE Sport's over the others.

Also, I run mine on a fast a** boat, and used it to temporarily correct a prop problem, it's was a lot cheaper than another $800 prop.  When you are making turns at high speeds, you don't want one of those whale tail looking things biting into the water and make the boat do things you ain't gonna like.

I still run it on my high performance motors because it just makes the hole shot sooooo much better.