Lumines is shallow, simplistic and way, way too fucking long. Cool music, sounds and style though. It's a great example of style over substance, and a nice easy puzzle mechanic so that any idiot can play for a long time and think they're good at it. It's like Tetris with three pieces, on acid.
Meteos is short, unrewarding, and frustrating. But a nice design and excellent control. My big gripe is that no matter how good I think I'm doing, I pretty much die at the exact same time, every time, on each different setting/world. The difficulty ramps up too fast, until suddenly, you're dead no matter what. I don't consider playing a game with the goal of not dieing for an extra 10 seconds to be very satisfying.
In VS. mode, it's a variation of the same problem. I either kill off the CPU worlds with little threat to myself, or die under an impossible barrage, with nothing in between.
In other words, neither game gets a vote from me. I think the studio needs to try again--third time's the charm. Meteos is the better game, so with any luck their next one will hit a better balance.