This may influence your decision. When I got my first enlarger (a little-known Vivitar V1 by the way, which is an excellent piece of kit), it was the size I wasn't expecting. Enlargers capable of 6x6 are not that small and you certainly wouldn't want to be moving them about all the time, unless on some sort of trolley. However, a 35mm-only enlarger is much more manageable.fairly compact to fit into a bathroom made for ants
Check dimensions and weight.