4U or 4U+?

I'm looking to buy another tamagotchi color. I'm looking to buy the next generation (I know the m!x is coming out soon), but I'm unsure which one to buy. The 4u has gotten pretty cheap, but people say the 4u plus is better. I don't know what the difference between the two are, besides that the plus gets more characters. Also will a Samsung Galaxy s6/7 work with the app. Some say that the s6 did work at some point, but then stopped working. Is the 4u worth getting, even if the app doesn't work for me?

If anyone will give their input, that would be much appreciated

Anyone?

I don't have the app for the 4U or 4U+, but I personally like the vanilla 4U+ better than the 4U. I think the colors (external on the shell and the LED artwork) to be more charming, and the animations on both are my favorite from all Tama devices. It's a pretty simple, but very cute Tamagotchi.