Bigger is better... within reason. They tend to be easier to see (based on size) and are usually a bit more docile and easier to handle. That is because of the size, turns tend to be a tad bit slower and landings tend to be easier because of the larger wing.

Now, with that said, don't confuse that with other, more capable aircraft. A plane, such as a Venus II (using one of my aircraft as an example) can really snap around and lands faster than a 60 size trainer would, but that's based on the design and is supposed to be used by a more experienced pilot than a trainer.

You WANT a trainer to be slow reacting so that you can try to "stay ahead" of the aircraft while learning to fly.

So, the answer to the question is yes. The 60 would tend to be easier to fly than, say a 40 trainer, again, based on size and the tendency to react slower than a smaller aircraft. Consider the mass that you are trying to move and you can understand why this is so.