photo for reference but a guy I know has these Two in tag ten highest ranked Both for $600 Should I buy them or wait for release date ?

Picked one up at the MINTD show for ~20$. Started looking into grading and saw some interesting numbers: Raw card: 20$-25$ LP/NM PSA 10 eBay last solds: 900$, 680$, 850$, 825$ https://www.ebay.com/sch/i.html?_nkw=greninja+gold+star+celebrations+psa+10&_sacat=0&_from=R40&LH_Sold=1&LH_Complete=1&LH_All=1&_sop=10 8.14% PSA 10 rate (2508/30825) https://www.psacard.com/pop/tcg-cards/2021/pokemon-swsh-black-star-promo/188712 PSA 9 ebay last solds: ~60$ 💀 46.19% PSA 9 rate (14240/30825) Positions: I've ordered a Beckett 9 with good sub-scores (9,9,9,9.5) and going to try and crack and resend to PSA https://www.ebay.com/itm/197828731013 Also gonna yolo send the pickup from MINTD LCS

If you were to buy one booster box long term hold A few of the same one which one would you focus on for the most upside long term gains