I use both but have much preferred uses for both.
Anything being skipped under docks or cover like flukes and wacky, all spinning.
Finesse fishing with light tackle "Ned", spinning.
And of course many options work well with spinning or casting.
Spinnerbaits, spooks, Jerkbaits are just a few examples that work much better on casting. Imo
Not impossible to use spinning reels but a small leader is paramount when braid is main line due to front treble romance.
Spinnerbaits which I throw a lot, want the blades spinning as soon as skirt touches the water, accomplished better with casting. Imo
I recommend both for better experience on the water.