I personally own a lot of 3-9 and similar power ranges including
2 Leupold VX3i's 3.5-10x40
VX3i 3.5-10x50
VX2 3-9x40
VX2 3-9x40 CDS
VX3i 6.5-20x50
VX3i 4.5-14x50
a recently purchased VX3 8.5-25x50
VX3i 1.5-5
VX5HD 3-15x44 CDS
Vortex Diamondback 3.5-10x50
Vortex Crossfire II in 3-9 and 4-12
Trijicon 2.5-10x56 Accupoint
Trijicon 1-4 Accupoint
Vortex Gen II PSTs in 3-15 and 5-25
Vortex Razor HD Gen ii 4.5-27x56
Nikon 3-9x40 (times about 5)
New to me Zeiss Conquest 3-9x50
New to me IOR 8x56
Point being here is that ive found for a eastern PA deer hunter/varmint hunter, these are my favorite ranges. You'll notice that i only own a few scopes (long range precision scopes included) that have more than 5 power on the low end. I really prefer a 3-15 or 3.5-10ish range for hunting. but stick to around 3 power on the bottom end. I do mostly field hunting for deer and varmints of all sizes but the 10 yard in-your-face shot is possible too and I learned as a young kid that low power is a handy thing to have but the ability to zoom to 10 or 15 power is nice. I personally dont see a huge difference in a 2x vs 3x power scope until you get really close to the target and a lot of that can have to do with the objective diameter and FOV. As far as glass quality, id say those Kahles probably would blow most of what i own out of the water so it really comes down to preference of the power range. If it were me, Id get the lesser expensive of the two and put the savings into good mounts like EAW or similar. If the price difference is negligible, id say get the 2-10. I wouldnt get too hung up on the power range since they are so similar. Id look at the specs for both and go from there, id imagine the 2-10 will probably have better features and performance since its a 5x magnification range and that is generally attributed to higher end scope lines.
As a side note, ive seen a lot popping up about Leica too, seems they are right up there with Kahles and Swaro, kinda interested to try one of the two out.