The Perception Sonoma 135 is a fine kayak for someone you’re size (I’m 5’6” and 165 lbs). Quite efficient and quite maneuverable. Good for flat water and moving water, but wouldn’t try it or any other kayak or solo Canoe in class 3 whitewater, because I don’t have the requisite skills or shoulder health for that.
The Swift Caspian Sea is a go straight kayak and a beast to turn. I’ve owned the QCC version, 400X for 10 years. I’d be hesitant to try it in class 2. I don’t even use my 400X on local shallow and twisty streams, because of it’s sluggish maneuvering and not wanting to scuff up it’s still smooth finish. It is, however, quite efficient and easy to keep moving at a decent pace, handles quite well in wind and chop with the rudder and has plenty of leg room. I had to pad out the cockpit in mine, so I wouldn’t flop around from side to side when trying to edge the boat to turn faster. I have a very difficult time trying to put the 400X on edge. I think it would really suck as a whitewater boat.
Some Caspian Seas didn’t have bulkheads or hatches, so watch for that.
The Sonoma 135 only has a rear bulkhead, so you’d need a front float bag for whitewater. It’s a fun little boat.