Normally (historically) military aviation is the best path to major airlines. Military wings are about the single most valuable credential to the best major airlines. But there are some drawbacks:
1. Things can go wrong (vision, medical, failing training). It's possible that you'll still have a military service obligation even if you can't be a pilot, which will delay your ultimate career progression as a pilot.
2. You might get assigned helicopters. In that case you'll need to acquire some fixed-wing time, either as a military instructor or at a regional airline before most majors will hire you.
I would normally recommend that if you're focused on flying and airlines, go the civilian path, get a regional airline job, and THEN join the air national guard or USAF reserve. That's the best of both worlds, and both of your careers can progress in parallel. If you really want to be a military officer and reach high rank, take the active duty route.
That's the historical norm. Today things are a little different...
Due to pending massive pilot retirements from the legacy airlines over the next 15 years, right now there is unprecedented opportunity to get hired, and for seniority progression (Pay and QOL depend on seniority. Two weeks seniority can make a huge difference for years, ask me how I know
). If you decided on airlines, then ten years in the active duty military is going to cost you a lot of seniority, and you'll likely (at your age) miss the bulk of the retirement movement. For that reason I would strongly counsel guard/reserve (unless you really want to be a general someday). Guard/reserve will not cost you much seniority if you time it right, ideally you'll want your initial military training to occur while you're a regional FO.