It really depends what the rest of the group is made of. Say you have 4 bladers in a group, your gonna have a hard time standing up and when you do get knocked down your gonna get hit with at least 8 stabs and up to 16.
If you have a mixed party with glaivers and bladers as XMoshe said you will find bladers spamming kd to often and actually helping the other team stay alive.
Four glaives always hurt thats alot of stun. You wont be able to do much when your stunned constant.
As always there is no "best" both do their jobs. I have no experience at 100 cap. But I would say they will both keep doing what they do. Glaivers high hp high dmg and bladers good defense with moderate damage.
If I was looking for a build to group pvp with and those two were my choices I would go with complimented what other builds I would be in group with.
Hope this helped at all.
