truthfully, i've never really liked either hal or kyle. not that i hate either of them, i'm just not overly interested in either character. the green lantern book doesn't appeal to me. never has.
again, i'm not sayin i hate it ... it just doesn't interest me.
but jla did. specifically the resurgeance of this current edition.
i thought kyle was great for morrison's JLA (as was the rest of morrison's JLA). he was a great addition and really got to showcase himself. his powers and creations were varied, his will was steady(ing), his confidence was perfect for that of who he was -- a rookie amongst gods. great characterization, and great dialog between him and the other charaters. he was one of the most enjoyable aspects of the run.
hal, on the other hand, i loved as the bad guy -- the fallen angel. the parallax storyline was fantastic (tho the wavering motive clearly weakened it). the parallax costume was also pretty bad ass. but most appealing was the fact that this guy, whom the jla had all known and trusted for decades, was all of a sudden more powerful than all of them combined ... and pretty frickin angry.
the thoughts of "what could have been" always make me angry that they later (and in almost identical inexplicable fashion) returned hal to the good guy life in final night... then watered him down further as the spectre.
if they had only kept parallax around -- a near omnipotent being, with all the sercrets and personal connections to the jla... he could have been the ultimate villain, popping up every so often, playing with their heads and established friendships... it could have been fantastic.