I'm not a drag racer but the 14R seems to be well liked at zx-14.com where many drag racers post. I haven't heard any say they want a gen 1 back to race.
I can see why you wouldn't want to have your street ride outfitted for racing but I have heard of pleanty of people who have used there 14 on the street and the track.
If you have the money, i guess I would mod the 14r and ride the gen 1 on the street----or get a busa at least it would give you an idea of what the other hyperbike is like. I have both and AFAIC it they are too close. At this point, I would rather have a 600 for a second bike.
Actually, what I really would do instead of buy a second bike is boost what you already have.
08 MIDNIGHT SAPPHIRE BLUE ZX-14 Now Deceased, will be resurected
2024 ZX-14R bran friggin NEW!