I agree with Duckroll about FFVIII being a far more interesting and experimental title than IX. Personally, I really enjoyed the micro-management aspect of its battle systems because ultimately what it allowed was for you to switch between distinct "modes" in battle.
For example, the least (obviously) interesting part was the "farm" mode where you'd enter a new area, meet a new enemy type and sytematically draw off as much magic as possible then move it to an appropriate stockpile to leverage a particular trait or ability.
The regular "fight" mode basically imvolved the player in making a decision as to whether they wished to fight using primarily physical or non-magic consuming abilities so as to conserve power, or whether to tactically expend magic (weakening their build in the process) for a quicker victory.
Finally there was what is probably best described as all-out "zerg" mode, which involved using purely the most powerful abilities to defeat enemies as fast as possible. Typically this would involve abusing Aura and Meltdown magic (2 of the most efficient spell types for raising most any stat) to keep the character in perpetual limit break mode.
This is a pretty cool system to me as it gives the player maximum control at all times, and was I feel super-rewarding especially once you'd spead your GF's smartly and had levelled them sufficiently to access the various "refine" abilities. This combined with the "zerg" mode would, for instance, allow Irvine to take out the end boss lightning fast with repeated volleys of LB'd pulse ammo, each shot hitting for max damage.
Coming from that experience, FFIX felt sadly dull and uninteresting to me, even disregarding the general sluggishness of the entire battle "clock" it was a real step down imho.
Add on top of that my preference for practically every other aspect of FFVIII over IX and its no suprise that the former title remains one of my favourite JRPG's ever, whilst IX I can't honestly say I even like, despite playing it through to completion at least twice. (JP and US import versions).