Ka's launch isn't what it used to be or maybe I'm just so used to it now that I'm remembering it as being more forceful a few years back. TTD's still feels much the same as it always has to me, but then I've only been riding Dragster for the past three years.
Ka should be ranked higher than 3-6 just due to the stronger forces & speed, but I go with how the launch effects the overall ride experience & Ka just seems to let up too much before going vertical.
Cali Screamin' isn't very forceful, but the launch is over water which gives it a unique element that none of the others have. White Lighting wasn't very forceful either, but it was my first launcher & as such it ranks much higher than it actually should.
Like TTD & Ka, Xcelerator & Storm Runner would be nothing without their launches, which both deliver on in spades. Volcano & Blue Fire are great overall coasters, but the launch of each contribute greatly to the ride & Fluch would just be a well themed Eurofighter without it's launch, so it's also way up on my list.
So those are my favorites (as the topic asks), but not necessarily the fastest or most forceful. :wink: