Differences?

I bought sm last year and really enjoyed the game!! Still really unsure whether to buy usm due to not knowing how similar it is to sm. Like what are the differences? Is it really worth buying usm? Thanks guys 🤘🏼

One difference is that Necrozma is the focus. Plenty of other differences but i don't want to spoil it if you have not played it. I say it is worth buying but that is my opinion. It is up to you if you want it.