From a pure career progression perspective with all other considerations aside...
1) Military pilots have the best opportunity to get the best major airline jobs.
2) Most military pilots will have to serve 10-12 years on active duty before they can begin accumulating the airline seniority that determines pay and lifestyle quality.
What you reallly want is the military advantage without the 12 year wait. There is only one way to do that, in this exact order...
1) Go to college, get GOOD grades, preferably in a technical major.
2) Get your pilot and flight instructor ratings done as early as possible, in college hopefully.
3) Work as a CFI, get 1000+ hours and 100+ multi-engine hours.
4) Get a job at a crappy regional airline with a SHORT captain upgrade time....
5) IMMEDIATELY after getting hired, as soon as possible, get accepted to fly for an Air National Guard (ANG) FIXED WING squadron. They will send you on active duty for two years for air force flight training.
6) While you were gone on military training, your regional airline seniority will accrue. This is required by federal law for military personal. You will come back and it will be like you never left. Soon after your return, you can upgrade to captain and get your 1000 PIC hours.
7) You are now about 28 y/o, a rated and current military pilot with 1000 hours turbine 121 (airline) PIC...you have the best of both worlds and will probably get hired at a major airline in short order. You have a 6 year lead on most active-duty military pilots who have to wait until age 34 or so to start an airline job.
This is a lot of work, but it is about the fastest and most reliable road to a major airline. You will need to reserarch the ANG as soon as possible, it is complicated to get in, you don't just walk in and "sign up". Also be aware that if you get mobilized due to war, you might lose a year or more for that (but you will probably still be getting valuable flight time). Good Luck.