I’d think clearly about where you ride, what conditions and how you like riding.
Too many variables will confuse matters.
Road = easy choice, choose something for the place you’ll ride most.
MTB = little trickier, choose something for the place you’ll want to ride most.
Trips IMO are fine, but you can do that easily enough with a small amount of planning, it’s the bike you take with you that makes all the difference.
Example: I’ve got an R5ca kitted out with Red, it’s been everywhere with me, road, cobbles, mountains. Each time I look down on the top tube and stem I think of all that road I’ve covered on it, and the memories come flooding back.
Bespoke route will cloud judgement unless you go in having covered off your main criteria, the builder will only build what you want and you don’t want to get that wrong.