Ditto on loving Schlitterbahn and I much prefer Typhoon Lagoon. Blizzard Beach while well themed is very much in the sun and is more like a typical water park (like a Wet n Wild) in the types of slides it offers. The one slide there I find more unique and fun is the slalom mat slide. The family tube slide is also a decent one. But Typhoon Lagoon has a set of three water roller coasters in Crush n Gusher along the lines of Master Blaster that is completely absent from Blizzard Beach and one of the best parts of Schlitterbahn ride wise and three longer tube slides that remind me of the older park tube chutes (all three of the “Falls” rides" except Miss Adventure Falls which is a family tube ride). My favorite parts of Schlitterbahn and what make it unique beside cold river water and shade is the tube chutes and water roller coaster all lacking at Blizzard Beach.
But if straight drop slides are your favorite there is still this one which is pretty wild (my mom lost her magic band it’s so wild on this one) Humunga Kowabunga | Typhoon Lagoon Attractions | Walt Disney World Resort
Edit: I also prefer the surf pool at Typhoon Lagoon to the wave pool at Blizzard Beach. It has huge waves that you really can body surf.