17-40L or 24-105L

I'm looking at buying an L lens with my 5D mark 2 but I am currently unsure as to which to get. I have heard great reviews on both but I still can't decide
Suggestions?

NEVER compare 2 lenses which are of totally different purpose.

Choose the focal length you desire.

Landscape? 17-40
General use? 24-105

My recommendation? Get both

Just depend what you shoot: 17-40L is UWA and lots distation if for portrait; 24-105L is general walk-around, ok for portrait & landscape. Both are f/4, which is bit difficult with long light photo.
Welcome to POTN.

Get the 24-105L as part of a kit. If you find yourself lacking on either end of the focal range get yourself another lens. Same applies to maximum aperture (if f/4 isn't fast enough). The 24-105mm is a good focal range to start, since it will cover most subjects (from landscapes to H&S portraits).

Think you could better start with the 24-105.

I broken my 24-105 on the second day of my holiday and have to use the 16-35 II or 70-200 II. I really mist the 24-105 for its all round use.

24-105 is such a useful focal length, as has been said. You really can't go wrong with having a copy in your bag. For years I sneered at it, thinking that f/4 was a noob lens, but now I own one, I can't get over how useful it is for general everyday shooting.