Difference Between HL and HL:Source

HL:S is the old HL running on the source engine but with the old models and textures, the only things that look better are the water and lighting.

This is all I could find through a quick Google search. ---> http://forums.steampowered.com/forums/showthread.php?p=15219952#post15219952

HL source has some graphical improvements but it doesn't support mods.
I'd say go with HL1 all the way, it has some fantastic mods, and if you want HL1 with better graphics just download Black Mesa mod.

I have played HL:source, and found it too difficult to finish. I will have to try the original when I complete HL2

Half Life is the original game. Half Life Source is still the original but use the Source engine basically for the physics and water, and lightly improved graphic.
If you really want to discover the original Half life, go for this fan made mode : http://www.blackmesasource.com/ . It's not complete (it's missing the last part, and this part is not the best anyway) but it was improved on source engine. Really enjoyed to play this one.

Well, thank you all for your answers!

That's weird, it looks like Source is getting more and more votes ...

Original Half-Life is better due to mod support.

HL:Source is pointless game...

Well if you're looking for one or the other, I'd say the original all the way. Honestly, I've never played Source, but I've beaten the original numerous times and the mods are fun. Good to have options.

HL does autosave once in a while. HL:S does not. Learned that the hard way.

I'm kind of lost here... I voted HLS because of the improved physics and water effects, but people are talking about a Black Mesa mod for HL1, so which one has the superior graphical experience?

• HL1 with Black Mesa mod?
• HLS with its improved physics and look of the water?

PS: I'm even more confused... I see a Black Mesa Reborn Mod here, it looks awesome but I don't know how good it actually is.

afaik Half Life source is pretty much a broken mess, full of glitches and game-breaking bugs

For nice graphics u shud play HL2 instead