So I decided to be a swordsman/gunner. I'll be weilding a BTB + Polaris.
Any armor sets + shield recommendations to complement my weapons?
Good armor and shield?
hmmm... When you run JK or Roarmulus you will be a pure gunner because your blade will be almost useless vs Slime & Construct.
If you want to play a single sword game I would recommend the Calibur line. What I would recommend even more would be to run 2 to 3 swords plus an Elemental gun (like the Polaris).
If you prefer faster swords work on the Brandish line and get the Shadow (Acheron) and one of the Elementals (Glacius/Voltedge/Combuster). This way you can cover all of your damage types and your gun will be good or neutral against all of the current turrets.
Sorry guess I totally ignored the armor shield question because I was focused on your weapon loadout.
Shield. I highly recommend having one each of Grey Owlite (Elemental/Normal/Fire/Shock), Barbarous Thorn Shield (Piercing/Normal/Sword DMG+), and Dread Skelly Shield (Shadow/Normal/Poison/Freeze). That way you can switch out your shield based on the stratum you are about to dive for optimal protection.
*Shield side note* if you are still in T2/T1 the absolute hands down best shield for a Sword/Gunner is the Swifestrike Buckler 3*. It gives Attack Speed Increase: High to all weapons (both swords and guns). The downside is that it is basically an offensive shield only good for bumping (not meant to soak damage) and it is a non-upgradable deadend at 3*.
Armor. Personally I geared for FSC so I went with a Vog Cub set. This works pretty well because the first 2 bosses most people grind out are Snarby then the JK. Both of these bosses are Piercing heavy and all of the 2* to 4* versions of the wolver line are Piercing/Normal/Sword DMG+. Losing Piercing when you upgrade to Vog is not a problem in T2/T1 because it has way more then enough Normal protection to handle T2/T1 work.
You might consider swapping in a piece of Gunslinger armor, but a better option if you want to buff you sidearm would be to keep a full Wolver line and add in Gun Weapon Module trinkets.
If you want to be an annoying antisocial loner, then get polaris. Get Nova driver or storm driver if you plan on playing with and helping your team. Anyways, for armor, you COULD try radiant silvermail anr grey feather cowl. Has every type of defense, as well as resistance to poison, curse (useful for 2 weapon- users), fire, and shock. Idk how well all resistance to dmg types work. If it happens to suck, then just get Volcanic plate set, with grey owlite. Pure defense
I'm not going to argue with you about the Polaris. I have defiantly had people annoy the heck out of me with them before.
I've tried out an all damage types loadout in T2 PvP before, equal parts Normal/Piercing/Shadow/Elemental along with equal parts Fire/Freeze/Poison. My experience was getting my arse handed to me buy pure damage swords (non-split). I prefer my armor to give me a weapon buff anyway. Radiant Slivermail is perfectly suited for Ultimate Snarby, but it doesn't really seem that useful elsewhere. I really would not want to take the negative ASI hit of the Plate Mail lines either.
If you have shields to cover all the different damage types then it is not nearly as critical to have the perfect defense on your armor. T3 is more about avoiding damage anyway; even getting hit by the exact type of damage your armor is tuned for is costly in T3. That said, having a suit of armor to cover each of the damage types is the best way to go (though expensive and time consuming). I picked FSC to work on first, because at the time it was the only T3 boss around. Now I may make other sets to do the shadow content, but I'm not going to touch that till it gets cheap to do so or I run out of 5* items I want to craft (again not any time soon).
skolver (and maybe a divine veil for elemental/shadow defence) seeing going for the vog's ASI is useless on BTB imo
but i have full skolver/vog/divine wich i use according to the stratums so i would say get all of them :)
you can also go for the snarby armor for shadow defence