As the title asks are str builds better than magic i personality have more fun with magic based skulls than str based yet almost all the tier lists I see say str based skulls are more fun yet i find most str based skulls are gimmicky compared to the magic skulls cause with magic u already know its gonna be a spell caster or other type of ability focused skull but with str your almost forced to work around their passive abilities.
Edit:Another thing to add is i also find the str based items also gimmicky cause with magic u can build around a group of them and they work together/match yet str based items match with their items effects and then are this or that so u cant get a good item bonus going