I struggled with what hybrid to purchase and I couln't find any new information, so I got them all. I figure I spent the money & time on this so I should share it.

shells - FLIP: love the flip! Never had any leaks and the few times LO got poo on the shell I could easily wipe it off the PUL inside and re-use it if I was in a pinch (like when I forgot a 2nd shell for the diaper bag.) I got them with the buy 2 get 1 free deal so they were very reasonable in price. If you want a one-size & trim this is the best I've found - note my favorite insert with this below.
GroVia: I really wanted to love this one because they come in such cute patterns, but the mesh inside felt damp all the time. I realize this is a bit silly since it is a diaper, but to re-use somthing that already feels damp felt wrong. Good news it never really leaked, just stayed inside on the mesh & on the insert. Also, the GroVia system costs the most.
Gdiapers: I purchased the G's because you can buy them at your local BabiesRUS and they are cute. I did not like them because they always leaked and the cute & soft cotton outter shell was always wet & getting LO's clothes wet. I sold them ASAP. They were the 2nd most costly shell.

cloth inserts - FLIP: since they are a one-size the stay dry insert folds to fit each size. They were a bit more bulky in the small size than I liked. They never leaked and stayed in place very well. I go back & forth on loving this insert and using the Gcloth with my flip instead.
GroVia: cost a ton for only 2, took forever to dry and I didn't like the fact that it snaps in (weird because was the major reason I purchased them in the first place.)
Gcloth: they are trim & I love to use them in my FLIP shell (these are sized in Small and M/L - I used the M/L in the Flip for both the medium & the large sizes. The cost is low & they work great.

disposable inserts - I didn't have a preference between any of them, I realized I like the cloth options better for all the diapers.