There's pros & cons to anything, I suppose. With this recent boom in sports cards values, it's hard to know for sure, but from what I've seen in 20-ish years of collecting hockey, forwards are king, followed by netminders & then defensemen. (as far as retaining values go) So I try to stay true to that. In almost any subset, etc Gretzky always outsells Roy, & Roy typically always outsells Orr...so that's kinda what I go on.
Granted, that's not always the formula, & these weird booming prices are all speculative at this point...but it sure is fun seeing junk wax become popular again. Or watching the Gretzky RC or the Jordan RC reach astronimical levels, whereas just as recent as 10 months ago or so, you could pick either one of them up raw for maybe $1,000. Nowadays, you're looking at $1,000 for a PSA 2...which is insane to me.
I actually own a PSA 9 Roy 1986 OPC RC. I purchased it from a store in Ypsilanti, MI in maybe 2003-04. I paid $200....now, I see one has sold as recently as last month for $2500. I've never seen that card that high! So, one would possibly think that it may bottom out again, just like other junk wax stuff has in the past. But I think WG will always hold his value over guys like Roy, Orr, Yzerman, Jagr, etc...but again...it's all speculative, and I'm no expert.