You're getting old for military, if you think you want to do that, better start doing research today, and be talking to guard/reserve units by Jan. You'll need a degree for that.
Practically speaking, if you don't already have a degree may as well do an aviation college to get the R-ATP and an associates. You can then either finish the bachelors, or go to a regional and finish the BS while working... that last will require discipline because career progression should move quickly and you don't want to find yourself competitive for a major with no degree.
If you have a degree, a good structured part 61 program is probably the best bet. Cheaper and offers flexibility to adjust the training to your needs. In 141, you have to stick the syllabus, even if you're ready to move on.
Be aware that a 141 school can, and often will, offer part 61 training as well (unless it's part of a university program). But 141 schools tend to have higher hourly rates, simply because the government will pay those rates for GI Bill students... usually takes longer and costs more.
I've trained and worked at both 61 and 141, and I would recommend 141 only for veterans with GI Bill, or those doing a degree program.