This is a question you're gonna have to answer for yourself. Are you ready for college? How are your high school transcripts? Honestly, are you ready for the challenge of college and AFROTC? Are you ready to accept that despite your best effort, you may not get a pilot slot?
As a prior guy, I can tell you there are tangible benefits to spending a few years in the USAF before going to college; but I needed to. I would've flunked out had I gone straight out of high school, and not only did I mature considerably during my enlisted tenure I also knocked off some college credits.
There are also advantages to going Guard/Reserves if you go to school, but honestly it would only be for two years as once you go into the POC in AFROTC you'll need to resign from the Guard/Reserves. When I finished my active duty enlistment and went off to college, I was in the Reserves for about a year and a half; it helped a lot but juggling it, AFROTC and college was a lot.
The main advantage would be if you wanted to fly for a particular Guard/Reserve unit, enlisting in it will help your chance later on; but if you intend to go on active duty that's not the route you want. However, you chances of flying and getting a particular airframe are better going Guard/Reserve.
Hope that helps, best of luck to you whatever you decide...
Cheers! M2