Well, the 8274 is huge, heavy, and very powerful. It works great for full size vehicles as well as smaller vehicles. you wouldn't want it on the front of a sami though. Way too big. Its been around for a long time and is very reliable and popular. I think also the 8274 holds more cable as well, so take that into consideration as well.
The HS 9500 is much smaller and lighter. Great for smaller vehicles like Jeeps. However, this does not mean it cannot be used on any other vehicle.
I guess its what you want. I've seen both on small Jeeps and huge full size trucks. You want smaller sleaker look, then go with the 9500, but if you want a big huge winch, then go with the 8274. I'm sure neither one will fail you.
Also, the mounting is different which means you'll need a different style bracket/bumper for either winch, so look at that when selecting the winch.
Do you have cooling problems with the 350? If so, then you'll want to stay away from the 8274 cause it is so tall it blocks the radiator much more.
There is a lot to consider between these 2 winches. Instead of being in different categories the 2 different winchs are prob. better described kind of in the same manner as Manual trans versus Auto trans. Its just what fits you and what you like and how you are gonna use it, neither one is better than the other.
Rob