Personally i find 2 more dex for me to be far more usefull then 50/60 more hp/mp for my pet.
Maybe more useful, maybe not. Even in DEX's best case scenarios, 2DEX is certainly a pretty minor boost though.
Possible DEX benefits:
1) WS mod:
No H2H WS you're going to be using at high level has a DEX mod, so this isn't relevant to us.
If you're not capped, 2DEX=1Acc. But in today's FFXI, you're probably capped on a lot of stuff. So maybe this benefits you in Voidwatch, some particularly difficult NMs, or maybe in some future content... but normal 75cap world content and stuff in Abyssea with Atma/Cruor buffs, you're probably getting no benefit here.
3) Crit rate:
Again, you might already be capped on dDEX (function of player DEX to mob AGI), especially in Abyssea with Razed Ruins and Cruor buffs, and with PUP's naturally high DEX (tied for 2nd among all jobs) to boot. I'm not sure whether/how the May updates have affected that cap though, so there's possibly more to this discussion (note that dDEX cap is NOT the same as overall crit rate cap and had its own cap in the past, it's just one component of overall crit rate, along with crit+ gear, merits, atma, Rogue's Roll, etc). If you AREN'T capped on dDEX, 2DEX might push you to a higher crit rate (between 0.25-1% crit rate per point of DEX depending on where on the dDEX exponential curve you are).
4) Overload rate:
Only mentioning this to be complete, and to note how much of a non-issue overloading on Thunder Maneuvers is. I think I have more DEX than my automaton naked (and once you have more DEX than the puppet adding even more adds nothing for overload purposes), and who's really spamming Thunder anyway? Plus, between Cirque body, AF gloves, and Buffoon's Collar, that's even less chance of overload. 2 DEX is not going to make any difference on this point. CONCLUSION
If you're capped Acc and dDEX (a likely scenario in Abyssea with RR), DEX+2 does approximately nothing for you. Pet HP/MP certainly wins in that case since at least it's something. If not capped Acc/dDEX, 2 more DEX will give you minor benefit that may be more useful than pet HP/MP.
Obviously, pet HP/MP also still wins for some specific purposes - automaton tanking, trying for max pet survivability, maybe it pushes you to a point where you can get one more nuke off before dropping below Aspir/Drain threshold, maybe you don't want to deactivate a mage puppet for whatever reason, any time you're using a mage puppet but not meleeing yourself, etc. Edited, May 25th 2011 6:25pm by Anza