I want to buy a copy of worms but Im not sure which worms game still has the biggest following online? I was thinking between worms armageddon or worms world party. I hate the 3d ones but im sure there is a worms game out there that still has a following in 2d online play

Armageddon .

Yes, Armageddon.

Armageddon indeed.
It's still patched with awesome features, with the latest beta update less than a month ago.
http://www.nanacide.com/wahelp/info-updatefeatures.php

!!Warning!!
Do NOT buy a downloadable version (Trygames or Gametap)!
The beta updates won't work with them! And also you'll pay many times more.
Buy from the T17 store (https://secure.team17.com/). They also have cheap multipacks!

If you ever consider buying a 3D version, you want to get Worms 4 Mayhem.

I've recently noticed more and more players on WWP though. It seems that they are becoming equal with players. Although you can connect easyer on WA.

Armageddon and Worms 4 Mayhem.