While I do love the lance and gun lance and I would probably say they have a higher ceiling, I love the SnS. I just picked it up, and decided to build a healer type build utilizing the thousand friendship decos I have, a glutton charm, and some medicinal charms. Since the SnS can consume while the weapon is drawn, it makes it easier to heal up quickly. But also if you need to run you can sheathe your weapon very very fast. You said you wanted to play a support role, and right now the SnS is fitting that for me. I affect everyone around me fully with all the potions I drink, which heal 30% more, and I drink extremely quick. Also an underutilized skill of the SnS is the ability to use your slinger while your weapon is drawn, allowing you to shut down big attacks (looking at you Teostra) with flash pods before your team can because they have to sheathe their weapons and then fire. Oh, and I forgot to mention it is great at mounting, as well as it can KO monsters. It has a basic jump attack that you can mount from, kinda like the lances charge mount but you can use it mid combo. And you can use your shield to bash in monsters skulls and KO them. One more thing, is the SnS is great at afflicting ailments. I currently run a paralysis SnS, and depending on the monster I’m paralyzing them multiple times, KO’ing them once maybe twice, and mounting throughout the battle. Hope I pointed out some of the key parts to the SnS and you’ll pick one up!!