id go with a 243 if those were my only 2 choices. how and what you load in the 243 is going to determine recoil...the heavier the bullet/charge the more recoil...i think a 100g bullet is pushing the edge with a 9,25 but from about 90g down will work well and would be a good rifle to learn on and after 1500-2000 rounds you can re-barrel to a tighter twist if you want or even a different caliber.
also keep in mind that if you want to shoot heavy bullets you can always put a break on it to reduce recoil even more.