Northwestern is a tad more rejective than Rice and Georgetown, not less.
'22-'23 admit rates and 25/75 SAT stats:
Northwestern: 7.2% (1500/1560)
Rice: 8.7% (1500/1560)
Georgetown: 11.8% (1410/1540)
ETA:
With respect to Scripps: your social opportunities would not be confined to Scripps, since all the Claremonts are within, oh, half a mile of each other. The “feel” would be more like that of a mid-sized school of 5k-10k students. And make no mistake: it is a highly reputable school.