I can’t commit to flying on a regular basis right now. I’m close to a Class B airport with a flight school. There’s a C150 for 100/hr and a Zlin 242 for 160/hr. Instruction is 50/hr. There is, surprisingly, only one cheaper option nearby, and the price difference is small, so the closer option of the two is better. I’ve been studying the AFH, PHAK, and FAR/AIM, so I know my stuff. I’ve not yet taken ground school. I can’t commit to flying regularly right now. Is it still worth taking some lessons? I’d like to solo on my 16th birthday, so accruing hours is important. Should I wait until school is out and I can fly more regularly, or should I just go for it?
My humble advice is to take a single introductory flight in the Cessna 150 to galvanize your interest and increase your motivation. Go to ground school first and then (preferably) start your flight training (in the C150) in earnest once you have the time and money available to take lessons on a regular schedule (once a week minimum, three times a week maximum [until the later stages of your initial training -when you are practicing what you have learned and not learning new skills]).
In my experience, having too big of a gap between flight lessons can be counter-productive and make for a (sometimes) difficult learning curve. This can lead to frustration on your part and, perhaps, result in your enthusiasm being diminished.
Frequent lessons will most quickly enhance your skills and your proficiency will improve steadily. Additionally, recency of flight experience will provide for greater personal enjoyment and reinforce your confidence, a very important factor in learning to fly.
Flight training nowadays is based on WWII-era programs that had the aim of mass producing pilots. Downside is that nowadays 40% of those who start training, don't get their PPLs (planeandpilotmag.com).
AOPA looked into this issue, and the top reform proposal to fix that is:
[Establishing] a standardized training syllabus that is carefully followed
— AOPA presentation; PDF; slide 42; bold emphasis mine
Which is based on data that suggests training syllabi aren't followed.
You can apply it to anything, not just flying. Compare it to going to university, and choosing to get a degree over eight years instead of say four. You risk losing steam and interest, and you won't absorb as much since there's little practice in between. So, I second @757toga 's answer.
I would say no. Flying is something that requires practice, you can't do it piecemeal. Once you can commit the time and money, go for it!
It's a very rewarding skill but like most of those, it requires maintenance in the form of regular practice. If you can't do that, I wouldn't get started.