i cant say, since ive never played hg/ss, but i did like crystal (since its the only one i bought).
hg/ss
gold/silver/crystal
HG/SS, due to the all the new mechanics that were added in Gen 3 and Gen 4.
Eusine and the whole Suicune plot is included into the games too, just like in Crystal.
hg :D i had gold back in the day, i don't remember much of it, but I REALLY like hg. i used the same starter in hg as i had in gold, a cyndaquil named gohan 8)
"My love for you, always forever"
HG and SS, since they have all the designs and whatsoever from the previous games that came out...Looks really nicer and cleaner. D:
The amount you have to catch just always keeps increasing, no matter what you do. But that's supposed to be the fun of when you start a new game and have to keep transferring your Pokemon around every game to the newest one to keep up to date. Your Poke's have to go wherever you go.
Race to completion is pretty much having the game consoles to trade them around in as well, which I find kinda funny.
I don't remember too much, since I have been transferring a lot around and am continuously working on my Poke's on the Black Version. >>

HG by a landslide. I thoroughly enjoyed Gold when I played it and I still do play it to this day along with Pokemon Stadium 2 (Damn you R2!!!) but HG...it took what I loved about the recent games and put it into Gold. Remixed music, better graphics and best of all....YOUR POKEMON CAN FOLLOW YOU AROUND!!!!! I love walking around with Mew and asking him how he's feeling. It does make you feel worried however, when say, your scyther pokes you in the tummy D:! That stuff can actually hurt you know. . .
You fools would dare to challenge the king of light and darkness? So you choose to do and so you shall feel my wrath!
Goals:r1 Bow Mastery(r1), r1 Shock(F), r1 Crossbow Mastery(rF), r1 FH (x), r1 CM (x), r1 Smash (x), r1 Alchemy Mastery (x), r1 Weaving(x), r1 Axe Mastery(x), r8 First Aid(x), r1 Frozen Blast(r5), r1 Barrier Spikes(x), r6 Mana Shield (r8),
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