Mars II Pro 300 vs 500

Folks, looking to purchase the Mars II Pro, but wondering about the projection quality difference between the 300 ANSI Lumen and the 500 ANSI Lumen. Significant difference? We’ll use it mostly inside, but would like to be able to use it outside this summer. We’re out of the city so it gets pretty dark, but is the 300 bright enough?

I’d get the 500 lumen instead