I do not believe I can do better than
Bryan for comparing the two bodies:
"You can check out the Canon EOS 70D vs. 60D specification comparison to fully compare these cameras, but here are some of the highlight differences (70D vs. 60D respectively):
- 19 cross-type AF points (f/2.8 at center) vs. 9 cross-type AF points (f/2.8 at center)
- Dual Pixel CMOS AF in Live View including Movie Servo AF vs. contrast-only Live View AF with no Movie Servo AF
- 7 fps for 40/15 images (JPEG/RAW) vs. 5.3 fps vs. 58/16 images
- 20.2 vs. 18.0 megapixel sensor
- Built-in WiFi vs. Eye-Fi cards
- DIGIC 5+ vs. DIGIC 4 (17x faster)
- ISO 100-12800, 25600 vs. 100-6400, 12800 (but you will not want to use ISO 25600)
- Clear View II LCD with capacitive touch capabilities vs. Clear View I with no touch feature
- Approx. 98% viewfinder coverage vs. 96%
- Metering EV -1 – 20 vs. EV 0 - 20
- Shutter lag of 65ms vs 59ms
- Intelligent viewfinder
- Viewfinder grid lines available vs. optional focusing screen required
- Dedicated viewfinder level indicator vs. exposure meter doubling functionality
- AF Microadjustment vs. does not have
- Zone AF vs. does not have
- 23 Custom Functions vs. 20
- Additional shooting modes
- Ultra High Speed (UHS-1) memory card support
- Stereo in-camera sound recording vs. mono"
It does depend upon what you shoot if any of these differences mean anything too you. But, the one I will highlight, the 70D has AFMA and the 60D does not. AFMA allows you to calibrate the focus plane of each lens to each camera body. Like any high performance equipment, there is variability. This is less of an issue at apertures where you have a great DoF, as that large DoF will swallow the actual difference. But if you plan to start shooting Phase Detect AF (through the viewfinder) with shallow DoF, this can become a critical feature.
After that, for me, the EV -1 vs EV 0 would be nice as you can focus in 1 stop lower light. And the UHS-1 memory support and DIGIC5+ would be nice as you may be able to write to a memory card and process faster.
But, make no mistake, both of these cameras are capable of many of the exact same things. Generally speaking the better AF system, zone AF, and a few extra FPS will make the 70D a little better for wildlife, sports, and action (including around the house action). The extra stop of EV sensitivity will cause your lenses to hunt less in lower light. And the AFMA is a very nice feature if you will be shooting with shallow DoF. But, all that said, my sister owns the 60D. It is a very nice camera. In fact, even after owning it for a couple of years now, I think she is still getting to know its features.
Good luck.