When did you see La Cage? I haven't actually seen it yet (I'm going tomorrow), but since you have already gone, go with Mary Poppins.
As another poster stated in the thread, sometimes going back a second time (especially not that long after you originally saw it) may tarnish your memory of the show. I'd give it some more time before you see La Cage again (Hodge also just extended his contract). That said, see something new and different and form your own opinion about the show. You're going to get people here who hate it, love it or just think it was okay. I would say it is worth it to see Mary Poppins. It isn't a complete trainwreck of a show, and it has some amazing visual effects and moments. If in the end you see it and dislike it, at least you'll have crossed another show off your list.
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611