Also check your rails on the steel tracks. I've seen some pretty decent pads bolted to some absolutely worn out rails.
I second BUSI's comments. Personally I'd rather error on the side of steel. I just really like how they work a lot better. Even if you don't think you'll need them when you're trying to push stuff, blade, or anything like that at least I've had better luck traction wise with the steel. Today for instance driving a Yanmar that's a nice enough machine, but there were many times I was spinning the tracks in the soft dirt as I backfilled and I wished those tracks were steel.
Again really depends on what you're doing with it. The trick with the Steel ones is make sure they're in good shape, they're very expensive compared to rubber IIRC. And there are more wearable parts, pads, rollers, rails, sprockets, instead of just the sprockets rollers and the track itself, for the rubber ones. Also make sure to keep your steel tracks in adjustment, I have less experience with rubber so while I assume you have to watch the adjustment on them I would imagine that without the pins on each link that the rubber tracks probably would behave better than steel in the adjustment issue as they wear. But someone with more experience on rubber ones could tell you more about adjusting them.
The trick with any tracked machine is pay close attention to the undercarriage. It's always a bad day when you have to put a track back on, etc. Keep an eye on it and you'll be happy, forget about it and it will be a long day....
