For combat uses, both are fairly equal. Where Dex shines is outside of combat. You can sneak, dance, balance, climb, evade, pickpocket, use ropes etc... all with Dex. With Str you can... lift things? If you don't want to be a glorified pack mule, go for Dex!
Depends on how enemies behave. In Dark Souls 1-3, I usually go strength build cause enemies are far slower. Elden Ring I went a dex build cause they enemies are much faster. In unknown scenarios, I'd do half and half so I can be prepared for anything.
And then, after being isekai'd, I'd proceed to do everything I can to avoid being sent to fight in the frontlines.
Even if I was forced to participate in the way, I'd try doing it as a priestess or whatever.
Basically, I chose a normal body type to be a normal person that doesn't suffer from a lack or STR/DEX, then would do my best to live like a normal person.
Depends on which weapon I'm using, but since I like torturing myself, I often go for whips which are mainly Dex weapons most of the time.
Also, even when using a Str build, you will not catch me wearing actual practical armor, my motto is ' born by the drip, live by the drip, and be undone by the drip'