Welcome to the board, Dan!
If you're a huge outboard fan, the choice would be obvious.
If I understand your post correctly, both boats are '98s but one has a '92 evinrude while the other has a '98 7.4L.
All other things being equal, by all means go for the big-block boat. The engine's newer and has much more potential...However, the stock 7.4L is no 454Mag, it's still a good motor.