Level 280 PeltC3 here. Actually Sw>PeltC3>Corsair>FencerC2
PeltC3 is usefull for the umbo thrust, it reduces 100% of all the enemy defenses (magic included if im not mistaken, never really tested it) this is verrrrrrrrry usefull trust me. In a party this debuff makes the bosses/monsters die twice as fast (its a major contribution to the DPS).
If you want a stun/imobilize skill then you should go Corsair at next rank, Iron Hook is the same as arest but it stuns and can be used on 3 targets at once (but dont work on bosses and have no defense drop) he also have keel hauling for pvp (pull a single enemy stuned with the hook) and Jolly Roger is always a nice adition to a party since it makes you get more gold, raise your drop rate while in the area and give you an attack bonus.
For the last 2 ranks you could go RodC2 (if full tanker), HopC2 (Almost only for finestra) or my personal favorite FencerC2. Fencer ads a lot of damage compared to the others, while also giving you evasion and some other defense drop skills (Wiht PeltC3 you can get a 100% defense reduction on piercing and slash atacks on the enemy runing all the time)
I would recomend building Con and Dex (you only need around 90-100 for a nice evasion since your skills double it) mainly if you want to be a hard tank, if you want to be a bruiser put some of the Con points in Str.