Beautiful Charizard! :) I'd personally send it to PSA just because I know them better. I have PSA graded cards and the people there work very efficiently (even if their turnaround time is not fastest), I think their rating system is fair and accurate, and PSA graded cards tend to sell more than their BGS counterparts.
I'd reach out and contact whoever you go for before sending anything though because of the whole covid issue. Make sure they're accepting cards!