the R is a 675, the RS is the 765, theres about 15% difference in power between the two. its not just suspension & paint on this generation of the bikes.
the RS comes with a brembo MCS master cyl, so you don't need to upgrade it to and RCS (its like having an RCS 19 20 21 all in one because you can select the ratio you want)
the brakes are beyond amazing, i reckon it would outbrake my 1000R, the feel is certainly much much better.
I'm really surprised you didn't notice much of a difference between the bikes especially with the suspension, i've ridden both and was pretty disappointed with the zook, was hoping the suspension from the 1000R would get re-valved and put on the GSX-S series but it hasn't happened, it falls well short of the mark IMO.
i'd pick the RS any day, then just soften the suspension up a bit for street riding. but then again everyone has their tastes.
i will agree on parts being more scarce than jap bikes, 100% agree, but there is still a tonne of support.
i just re-read this comment and i feel like it comes across as argumentative, genuinely not intending to do that.
FYI, Triumph is selling three versions of the Street Triple 765; the base model "S" with non adjustable suspensions, floating calipers and dash from the 675; R with fully adjustable suspensions (pretty similar to the previous 675R), color TFT dash, radial calipers with brembo MC and upgraded power and finally the RS, which gives you the M50 calipers, big piston fork, and Ohlins shock. The RS does have a slight power increase over the R, but not as dramatic as the power increase from the R over the S. I guess Triumph was trying to do something similar to the Monster lineup on which every level adds a bit of power?
More on the rationale behind getting the S750 over the 675RS...
if I had gone with the ST I would have kept the OEM master cylinder, even though its a mass produced Brembo, not an RCS, but on the S750 it had to be upgraded, it's by far the worst part of the bike (and first bike ever I've felt compelled to upgrade the MC, it is THAT bad). As for the suspension... The stock one on the S750 is acceptable, the forks are not THAT bad (suprisingly so), the shock is awful; I could very well have done with only an upgraded shock... But upgrading the shock would only highlight the forks limitations, so I went full retard and got aftermarket suspension all over, which puts it well ahead of the factory installed suspension on the RS (BPF are very good, so is the shock, but just the fact I have springs for my weight give it an edge). Engine wise the S750 can keep up very well with a 765 up to 125mph or so; it's deceptively fast because of how smooth and linear the power delivery is (probably smooth to a fault), past 125mph the Triumph will run circles around it... But really who cares going that fast on a naked bike? I like control, thus my focus on suspension, twisties and got a naked bike because the full faired bikes just make it really easy to go stupid fast between corners; the S750 does that just fine, it's not a track bike although I've already taken it to the track, it was fun, but it will live 99% of the time on the street.
There is something else I didn't mention, which was crucial on my choice... Peace of mind. The Daytona makes all sorts of noises you'd never hear from a Japanese bike, some good like that intoxicating exhaust noises I can't get enough of; some that make for pucker moments, like when the hydraulic cam chain tensioner drains and the engine sounds like its about to blow up on startup. This is only exacerbated by heat, 675/765 run stupid hot! I'm not saying Triumphs are unreliable; I've done nothing but routine maintenance on my Daytona, but it just doesn't inspire confidence like the Suzuki does.
Out of the box, stock, even the mid-range 765R is better than the S750; no question about that, probably even the base model S765 (never looked into that one because of the floating calipers, which will require a fork swap to get rid of). But I always take all factors in consideration, and the price difference opens the door for a lot of upgrades on the Suzuki.