There's a few things going on here:
By nature of the discussion surrounding the draft going into it, the fan base was primed for the Tigers picking one of Crews or Langford going into it (both Tiger and national reporters were involved here)
Langford is much more high profile given an appearance in the CWS more recently, Clark doesn't have the public tape / record to match.
Langford is a college player, Clark is a prep player, which leads to assumptions (not ungrounded, fwiw) that it will take longer to see him if things go well than it does for Langford, who has more experience.
The fanbase is separated by two years from the selection of Jackson Jobe over Marcelo Meyer, and there's a segment that seems to have reacted by treating this situation as being the same, when it really isn't (ie. had the Tigers taken Langford at 3, Clark would have gone in the very next pick)
Overall, these guys are both extremely talented players.... Clark isn't a Jobe who would have went 15 picks later had the Tigers not taken him, he's a guy who could have easily gone 1-1 in a different draft. And Clark, if he's as talented as advertised, will move fairly quickly one imagines.
Either way, I would have taken Langford, but I get the Clark pick, and just the general disposition of trying to take more younger, high school bats in this draft. The bottom of the Tigers system is fairly empty at the moment, and this is a good way to add talent and give the player development staff (many of whom are fairly new to the org) some talent that they can work with and put their stamp on.