That review definitely suggests it's Grand Slam for me.

Finally! I read the whole thread feeling more confused with each post but this edit on the Amazon review settles it for me : Thought, anticipation and strategy are all things I look for in a tennis game, add to that that the online is better and we have a winner :

Grand Slam Tennis!

Thanks for this thread guys, I have been trying to figure out which one I am leaning towards. Since I mainly play online, it looks like GST is winning but I also like the faster pace of the VT. I'll probably rent them both and then pick the one I like better ;)

Yes we do.  Let's spread the word.  No more confusion for those trying to decide.  Grand Slam Tennis is the answer. 

By the way do you have the option to add friends in this game and play against them or do you only play against random people?  Would be nice to play online against the best of VGChartz.

the graphics of GST just really throw me. I usually like cartoonsih graphics, but i cant see it working on a tennis game.

Pretty sure I'll be picking up Tiger Woods (first full golf purchase), and probably renting GST later. Once it drops down to a reasonable price, otherwise I'll wait for next years version - which should be a lot better.

Poor Sega, put out a good game for once - and EA is there with a monster to top it ;)

@tuoyo: In GST you can play against friends, you can even add your Wii friends to the GST friends list.

You can also play with a guest account just for a quick match. You can play ranked/unranked singles/doubles matches. At the end of the match, both players can agree to a rematch. There are leaderboards for nations and players (you can log into the account at EA's website and change your country if it's detected wrong).

But the best part of the online is that it's really fast to find someone to play with (almost instantaneous as far as I've seen), and lag almost doesn't affect the game at all (I only noticed slowdown once). Basically the online is flawless as far as I can see.

only thing i miss in GST is online tournaments

is there an "official" GST thread for the people on this site list their user names on GST so we can add them as friends?

Mine is ... "lazyrider" and I will online tonight.

That's a good idea.  Dont think I have seen any official thread though.  And thank goodness the game doesn't use retarded friends codes.