During the Max Battle Day on April 25th, who’s the best to prioritize in terms of meta relevancy?

So, I'm planning to do 8 total max battles with the 1700 that I have currently, the 1600 collection limit, and the 4 max particle packs that I have saved. Just wanted to know, what's the best one out of all these four?

So far my only gmaxes are:

all galar starters
lapras
grimmsnarl