The eurotrax have adjustable cradles (i believe) that can be easily adjusted for different sized cats where the CatTrax are determined by the length of the axle and the holes for the cotter pins.

Newer ones have holes for 8’ & 8’.5’ cats (i think), but you still need to remove cotter pins and re-pin them to adjust... not hard, but not an on-the-fly adjustment. Pliers are needed and would wear out the cotter pins.

I have CatTrax and ended up latter needing 1. cradles added and 2. an axle extender for my new (8 1/2') cat. In the long run... it cost me more than if i bought eurotrax