I would buy a card in each slab you might go for - BGS, PSA, HGA, SGC maybe. Then decide what you like. If it’s PC stuff you are going to keep forever then it doesn’t matter what the case is,
pick your fav. It might matter if you intend to sell later or for your kids to sell eventually.
I have a couple BGS because I wanted to know sub grades. This also makes it easier if I wanted to cross over to PSA.
with the massive moves by Collectors Universe I feel they will be the industry leaders for 10+ years easily. People just feel safe with the case and the rep behind it now. Once the backlog is cleared it will be awesome so if it’s resale you are after it’s definitely PSA. You can check this by comparing last sales of identical SGC vs PSA vs BGS cards. Massive differences.