Desktop Aquarium Advice Please

A friend of mine had just offered me her biorb life 60 is this a good choice?

I have already posted a reply to your other post. I made the comment that I would not trust cherry barbs with a betta's fins.

You could always take one of the sponges form the U2 (it should have 2 sponges and a box of ceramic media, so that would leave 1 sponge and the ceramics still there). Then cut the sponge up to make it fit in the new filter. If you started with a few fish there should be enough bacteria to cope. You would probably be safe to get around a fifth of the body mass of the fish in the Roma. By body mass, I mean size for size.
Keep an eye on the ammonia and nitrite levels, hopefully they would stay at zero but if not, do water changes till they do. Once they've been at zero without needing water changes for at least a week, you would be OK to get a few more fish - but no more than a third of the fish already there in one go.
And also keep an eye on the levels in the Roma for a week or so.