I have never been either, but I am looking real close at them or the gulf star out of tarpon springs. Gulf star is a little more money but less people. Both of there deep drop trips look amazing. Check out the Florida sportsman videos on YouTube. They have 3 or 4 really good ones on the Yankee capts. Gulfstar also has videos on youtube. If you pick either one let me know about your trip.
I went w/ Yankee in late June a few years ago, not a good trip. Hot, strong tide, the smell from the bunks was horrible. There were some good fish caught though, just not like Spring or Fall trips.
Most people I talked to said the Presidents day trip in Feb was best of year. A few people I talked w/ said Gulfstar was better but have never been.