I misinterpreted that barb 3 > doppel was going to go into rod later and not shinobi, which was your plan.
then neither of the choices will fit for you. doppel c2 and dragoon are both dps class, it would not give you that much utility. if you would want more utility (a possible boost also for your tanking capabilities depending on your stat allocation) then go fencer. it would give you eva buffs which is a big help for tanking (IF you are DEX build, and I know it would not help you against magic mobs but will still give you enough protection from physical mobs). dragoon would not bring you the utility you are looking for but will give you single target DPS, specially boss monsters.
and also, several people have given you the pros and cons of taking either with your current build. I donāt know what else you want to hear. and the way I see it, you are really intent with taking Dragoon, then go for it.
So late, already Dragoon. itās really good and I really donāt regret it.
iām not sure you have enough experience with it.
I found out Dragoon Gae Bulg make all my party attack TWICE. with their basic hits.
not only thatā¦ already got to class level 8 and I have Serpentine 1, Dragoon Tooth, and Gae Bulg max.
the debuff gae bulg give is really a party boost. and itās easy to use and apply.
doppel look really badā¦ donāt know why i even thought about doppel.
Fencer is too elegant for me lol.
thank you for the help so far. I donāt need any more help regarding this issue.
Thx for the tip on gae bulg.
I think itās because of Gae Bulgās skill attribute called Attack Zone.
Nonetheless, great that you are enjoying your class, itās what matters anyway 
No, itās not the attributeā¦
the skill itself has another debuff.
the attribute is seperated 15% buff, to attack, magic, def, and m.def
the skill debuff is 7.5 status effect, when that status is active on a monster
my attack hit twiceā¦
for example if I hit for 1000, I see another 1000. and if I crit, I see another crit.
and it also apply to my party basic attacksā¦
it seem to work only with basic hits, and some skills, but no all skills. my guess is it doesnāt work on multihit skills.
regardless itās pretty sick buff, and my gae bulg already hit around the 10-11k.
usally use bash into gae bulg.
also want to mention the spear pick up range is huge, mean you donāt have to go all the way to the spear, just slightly halfway to it. easy pick.
the fact I have now accses to high damage pierce, slash, and strike skills all together on my kit, really made my character able to kill anything he face extreamly fast.
I do feel superior to hoplite>doppel>dragoon.
I even compared damage and they just donāt get near close.
not only thatā¦
the amount of CC chain I do with stuns allow me to stay alive and use bash infinitely easly kill any monster without taking single hit.
feel like there high synergy between dragoon and barbarian.
yea I really enjoy thank you, and leveling with my premade party of friends let me quick level and clean maps together, already at the 240