My Favourite would be Imagine, I guess, but like others Im no fan of any Beatles solo work, I dont know, Ive tried ....
Maybe for me the magic just isnt there for me. Ive tried to analyze it but I cant.
I think the problem is that we tend to compare the solo works with the Beatles production as a band. I guess that's unavoidable for a fan. But that's not a surprise if we see the Beatles as the best band ever, so that each member had nothing to do but going down after the break up.
From that point of view, it's easy to think that their solo careers were worthless. Other fans, perhaps the most devoted ones, have a diametrically opposed position and still expect each solo release as if it was a new Beatles album from their glory days. Talking about me, I used to be closer to the first case than the second one. But now I'm more in a half-way, I've learned to appreciate some solo albums for what they are and not for what the Beatles were.
Anyway, there are not so many solo Beatles albums that I really like, since I usually listen to no more than half-dozen of those records; but I find that they're quite good even though the old magic is not there.