Michael R 1974, thanks for the excellent posting of pros and cons. I would add two more, and these are the two reasons I switched from Paterson to SS:

1. SS uses less chemistry. For one roll of 35mm, it's 210 ml versus 325 ml.
2. Paterson has more parts to clean and dry when you're done.

Regarding loading: After practicing a few times, SS has become just as easy for me to load as Paterson.

But plastic may be better for this: If you have a plastic 220 reel, then you can load two 120 rolls onto a single reel. Push the first roll as far into the spiral as possible, then load the second roll. OTOH, I haven't actually tried this and I don't know if my adjustable reels can handle the length of a 220.

Mark Overton