A couple thoughts:
1. Very versatile weapon and cool move-set. I would recommend for beginners the raw gem early game and maybe after a couple bosses and investment points in dexterity, the sharp gem infusion. With that, you can get damage to 300+ and boss fights are not too bad.
2. After a while, you'll have an idea of when to use dual vs single-handed. Don't solely rely on one vs the other as some bosses (like Lothric and Farron) are actually better taken on with a sword and board approach, while others (crystal sage, deacons and maybe even Dragonslayer Armor) you want to get in and deal as much damage as quickly as possible.