Comparative strenght between the high end summons of warlocks, and blackguards?

[Gobbo Champion Inc]

Do the LE, NE, and CE Tier 6 summons match up evenly, or are there noticable differances in pvp or pve between them?

[Aren]

They match up pretty evenly. Be aware though, that the Pit Fiend has been bugged for a while, and will not cast Improved Invisibility (unless it’s been fixed recently).

[liver and bones]

It comes down to class specials, epic caster levels, and foci.

A warlock is going to go 30 bard, so that's 21-30 for epic caster.
A BG with a summon will likely go 16, so that's 11-16.

A BG has:
+4 STR Bull's (so +2 AB) to share
+2~5 STR Bull's wand (+1~2 AB)
+2~5 DEX Cat's wand (+1~2 AC)
+4 AB and damage from divine might
+4 AC from divine shield
+3 AB from odd epics
+3 AC from even epics
+3 STR odd epics (rounded down to +1 AB)
=
+11~13 AB, +8~9 AC, +4 damage

A warlock has:
+1 AB, AC, and damage from SF: Conjuration
+1 AB, AC, and damage from GSF: Conjuration (possibly, need confirmation as to what "Greater Spell Focus: Conjuration does not increase the tier as it normally does with Summon Creature, but instead, it will raise its stats slightly" means exactly)
+5 AB from odd epics
+5 AC from even epics
+5 STR (+2 AB) from odd epics
+2~5 STR Bull's (so +1~2 AB)
+2~5 DEX Cat's (so +1~2 AC)
+4 AB from Eldritch fire (or +4 AC from Eldritch cold)
=
+10~16 AB, +8~13 AC, +2 damage

By raw stats "warlock summons" are better.