picking the option with your PC’s highest modifier seems safe.
It also seems logical (at least to me) ...
Diplomatic Paladin with lots of experience in reasoning, will allways tend to use Persuation ...
Scarry Barbarian with lots of experience in making people fear him, will tend to use Intimidation ...
Cheating Warlock with uggly habbit to lie whenever he moves his lips, will tend to use Deception ...
And that is where their proficiencies are.

Same goes with other skills ofcourse ...
Even tho i still believe that some skills should get in certain cases bonus from alternative Ability score ... like Nature + Wisdom, rather than Intelligence, if you are Druid ...
Still if you get option to either roll something your character is profficient with (aka. is experienced in that field) it makes much more sense to me to pick that option ...
Especialy if the only alternative is to pick something he is not profficient with (aka dont have experience) and he dont have ability score high enough to support such attempt (aka having natural talent in that field). O_o