If you join AROTC the training is the same.
If your interested in the NG their are a couple choices, you can complete AROTC and then select the NG prior to commissioning. You can also join the NG and complete the same AROTC program while you drill once a month and 2 weeks per year, you would be a SMP cadet but would still receive the same training. SMP cadets can also compete for Active Duty.
The only path that requires NG/Reserves is if you accept a GRFD Scholarship which requires you to fulfill your service obligation in either the NG or Reserves.
No matter which path you select, the training is the same.