I use both the Ortofon w/1.1 mil conical and another conical, a 0.7 mil, on a Stanton 500. I have no experience with the AT70. When using those two cartridges for Mono record playback, I'll sum the signal to mono in my phono preamp.
What I find remarkable about the Ortofon 1.1 mil is the suppression of click and pops. It won't make a completely trashed record sound great, but on those discs that might appear (and likely sound) "VG" or "VG+", I can expect them to play-grade much better than expected. It's become my cartridge of choice for spinning old mono discs. Tracking at about 2.8 grams, it does a wonderful job with both 45s and LPs. Perhaps the larger diameter of 1.1 mil makes a difference or maybe it's just a higher quality stylus or a combination of both factors. Cost of course is not always the final word regarding quality, but the Ortofon 1.1 mil stylus is quite a bit more expensive than the Stanton 0.7 mil conical, FWIW.