I also have both, sometimes i go with 24-70 and another time i go with 24-105L, and all that in the past, then i dropped my 24-70 for second time and this time the mount damaged then i sent to service and it stayed that for years as i couldn't afford the repairing/fix payment, so 24-105L became my go.
Also, the first drop of 24-70 the filter stuck on it so i didn't use it much, and when i traveled to Scotland 24-105L was the main use over 24-70 and it served me very very well, it is difficult to go with one over another, both have pros and cons, 24-70 was faster and has 2.8 for low light and the colors out of it to my eyes were better, but 24-105 has IS that may help in some situations where i have to handheld, and also the reach.