Wis as being steady perceptive it reacts more but does so by being aware and it might take longer on its attack for some benefit? I think of Int as being quick predictive thinking instead of reacting to an already occurring situation but it is highly analytical and preplanning too hmmmmm .
So yeah there may be difficulty differentiating them in anything but a flavor fashion..
I was thinking in 4e that most of the powers and feats with Figher Wisdom riders ended up being the same ones I would Tweak via a combat style into being Intelligence riders.
I couldn't decide if this was Wisdom or Intelligence secondary... decided intelligence as its so much about predicting and analysing but could be either.
[awesome scene of RDJ as Holmes in a fist fight]
What would the functional, game-play difference be, in 5E?
Could be knowledge checks, too. And a 'right tool for the job' ethos, with specialized variations on weapons specific to a foe he expects to face...Off the top of my head, I'd let the INT fighter make a lot of Investigation checks or somesuch, for weak spots, vulnerabilities, etc., .
Off the top of my head, I'd let the INT fighter make a lot of Investigation checks or somesuch, for weak spots, vulnerabilities, etc., and let the WIS fighter make Insight checks to predict their opponents next moves.
The first time???Actually a Guard - who's actually good at his job for the first time in D&D history - would be a possibility. A sniper also makes sense - about calm, deliberate attacks and spotting targets.
There is a Strength Cha wizard on full metal alchemist.... I thinkWhat's a STR-based wizard like?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.