Only 2 lines I would say is Asgard and Dragontooth. Not particularly my favorites but they seemed popular at one time. Honestly not sure if those were product lines or manufacturer's...so may not be important  

I absolutely love the Grenadier line.  What is it about them?  Maybe it's their charm.  It's certainly not the detail.  I use them whenever possible.

I started out collecting Ral Partha when I was a young player.  Box sets like Skeletons and Goblins.  I really like them, too.

No question, the official Ral Partha 11 series were high quality, good representations of the MM pictures and included great versions of the major Characters.

J

Ral Partha, although I do cherish the old and crude Grenadier minis.  Got boxes and boxes of them from when I was a miniature collectaholic.  Still find myself lured in once in a while.  I always told myself I'd paint them all once I retired.  A lot of the new minis are well done too.

I like the old Minifigs D&D line from the late 1970's (the pig-faced Orcs and Hobgoblins are straight out of the blue basic rulebook).

The Grenadier 'solid gold' line was a favourite at the time, but the look pretty basic now compared with later stuff, the Ral Partha 11-series was very good, although some of the monsters looked a bit 'delicate', and the character poses were pretty wooden.

Of all the 'official' lines of D&D/AD&D miniatures made, I consider Citadel's to be the best, hands down!  The 3-stage characters were superb, and the variant heads/weapons on the monsters made collecting the range a great challenge, and they were very faithful representations of MM & FF artwork too.

If anyone is interested in more info about the Citadel AD&D Range, I have a website which catalogues very nearly all of the range, at http://www.otherworld.me.uk