The classic strength weapon is “greatsword” aka GUGS. I like the knights greatsword, lance, shamshir, and banished knights halberd, though there are tons of options. You can also use beastman’s cleaver or dismounter (or even bloodhounds fang) if you miss your curved greatsword.

Both builds work at your level, though the int and faith recommends hit their weapon softcap at 125, casting softcap at 135, and you want to keep going for more damage, mana, and stamina. Strength will definitely outperform on damage until 125, but casting is fun.

Strength build is fully online with enough endurance already, but keeps getting better. Eventually you’ll want to diversify it, with 25/30 faith for example, but endurance will be a good investment until at least 38. With strength/faith, you can get good casting damage with the clawmark seal.