Unless you're charging the Warlock action points to recover his at will or per day abilities-- as is the case with the spellcasters, if you're using the full TB rules-- then the Warlock should come out ahead on APs compared to the spellcasters.
Spellcasters have an AP cost involved if they want to get the full use out of more frequent/short rests; other classes don't pay this fee and so will have more APs available for other uses.
If the DM puts pressure on the spellcasters to use their APs for defense-- and spellcasters do tend to attract a lot of the wrong kind of attention, right?-- then they'll feel the pinch.
In TB spellcasters only get their cantrips and single target spells back after a short rest IIRC. They have to spend an action point to get back their multi target ones and spend another one for the big useful ones like teleport, scry, etc.
TB looks to nerf/tone down spellcaster balance by making it expensive to get back most of their big gun spells. Warlocks would bypass that entirely.
It would be possible to focus a spellcaster on single target only spells and have the spellcaster be raring to go all the time though.
Perhaps this question deserves its own thread... How have people done Psionics in Trailblazer?
Should psionicists regain power points with rest as a mage regains (some) spells? Or do you think that psionic versitility keeps the two fairly balanced as is?
The trailblazer campaign I'm in is heavy on the RP and lite on combat, so my Psion rarely is low on power points... but if this changes I might end up finding myself turtling behind my DR and good AC (adamantine body, etc).