I've shot both of those a lot in the past...Here's my Pro's & Con's of both=
Shuttle T's= PRO's
Best flight at long range that I've ever got with a fixed blade head after testing a bunch out to 100yds
Tough as nails and you don't have to worry about the blades coming out of them
Sharper since Trophy Taker bought them from Tight Point, and the new Black Op's model is supposed to be even sharper
CON's
Kinda pricey and not as easily found as some other brands "but it seems like most big stores carry them now days"
Still not the sharpest heads I've seen
Slick Trick= PRO's
Dang good buy for the money, standard Tricks can be found for less than $25 a 3 pack which is cheap these days
Sharp, all of them I've ever handled have been scary sharp out of the package
Really good flight out to about 70-80yds, then I had some drop off with them compared to Shuttle's.
CON's=
The long range drop off I mentioned above...It was really obvious at 100yds, but honestly I don't plan on shooting anything but foam at that range.
Blades aren't as strong as Shuttle T's....Not weak but not Shuttle T strong
Can be hard to find in a lot of areas
I'm probably gonna switch over to Slick Tricks for elk hunting because I can get them dirt cheap compared to other heads and they are a really good head.
