Given that both games are by the same designer and use roughly similar mechanics I guess the question might be which period are you more interested in and likely to want to play more often.You indicated that you preferred the modern era so I'd opt for Labyrinth.
Thanks. This answers the question of how alike the games are.
It might be useful to read some of the reviews and session reports on WW to see if it's what you want.There is also an AAR report on Labyrinth on the GMT website which you might find useful. Probably a bit difficult to compare the two games at this point given that one has already been released and the other is still in development.
The AAR at http://www.gmtgames.com/t-LabNarrative1.aspx
is very good. Thanks!
One selling point for me is that Labyrinth can be played solo, not sure if this applies to WW.
It certainly wasn't designed for solo play. Are the games really that similar?edited for url