I considered them also.
And also the 1237A
It's very confusing because they have 3"top" monitors at the same price point
View attachment 94287
Their relative differences should become more apparent when studying
https://www.genelec.com/correct-monitors.
SPL output is about the same for all of them - 110-111 dB SPL peak @ 3 m.
8361 has somewhat wider dispersion than the other two, but in return can be used down to <1 m if need be, being a coax and all. Its self-noise spec is 5 dB lower as well. So its preferred distance would be somewhat lower on average. Good dispersion H and V (though not as superb as some of the smaller models). Woofer Sd is about equivalent to one 10", I guess, but the amplifier is very powerful.
1237 is a true midfield design that isn't even properly coincidental much under 1.5 m, but is more directional so useful further out. At 12", it features the largest woofer of the bunch. If you need lots of deep bass without a sub, this is the one I would trust the most. Horizontal dispersion is good, vertical is a bit lumpy.
S360 is as loud and directional as the 1237 (and presumably can take quite a beating) and already coincidental at ~1 m but being a 2-way, is never going to have IMD levels as low as the other, 3-way models (should sound "shouty" when taxed), and with its 10" PA woofer is never going to pump out quite as much deep bass. Good dispersion H and V, save for a narrow crossover dip in vertical.
Actually, their pricing is not the same - S360A is the least expensive at 4 grand, 8361A is 5 grand and 1237A is 6 grand. This order seems sensible enough to me.
KH420 is somewhere in the middle between S360A and 1237... lower distortion than the former with absolute tons of midrange output (giving very low midrange distortion), but between its 10" woofer and weaker amplifier, not as much deep bass handling as the latter. Very good dispersion H and V. Driver spacing seems similar to 1237, so minimum distance likely similar as well. All analog, so no DSP built-in... they have that handled by their subs.