in the last 5 years and a couple of hundred flights I only had one aborted takeoff, which was quite harsh and required an equipment change after taxing back to the gate (brakes needed to be checked out). According to they pilot the got a last minute warning about a huge bird flock (couple of dozen Canadian Geese) crossing the flight path close to the ground and decided it was to dangerous to go all the way through. Probably the sane choice given the size and mass of those birds, would probably had caused severe damage to the CR9.

During the same period I had dozens of go-arounds, my record was a 5 time go around on the approach to SZG, the pilot announced it as last attempt before returning to VIE. The whole flight through the mountains was already rather violent/turbulent )crew even skipped any service and just kept everyone seated) due to strong shifting winds but the landing was really rough with strong crosswinds.

I guess that ratio of rejected take off compared to go-arounds for landing is quite reasonable as tentseller said: You have to land eventually, while a lot of issues which could impact a clean takeoff might be sorted out already during taxiing.