You're likely to get a lousy workout from a Kurt Kinetic because it's resistance is dictated by wheel speed. With the SS the resistance will vary only in conjunction with your cadence. You really need gears to make it work properly.

For the SS you need a trainer that allows external control of resistance, and for the most part that's just mag units.

I'd stick with the rollers. Why do you think you need a trainer? Get a resistance unit for them and learn to ride them with a heavy load/resistance ... worst case you can buy a fork mount if you can't stay on them.