The control, flexibility, and cost effectiveness make processing your own B&W a no brainer.
You get to choose your developer, and exactly how the film is processed.
Even if it cost the same, I would still do it myself.
My time involved processing my own pays a much higher dividend than the time "saved"
As a matter of fact, last I checked, it was about $12 a roll here. It takes me about 40 minutes to get to the lab, drop off the film, and get home, and then another 40 to go get the film when it is ready and come home. Probably $4 in gas as well. (Combining the trip with some others can help, of course)
When you do the math, it breaks down like this:
I can easily process 4 rolls of 135 in an hour. My cost is maybe $1.
Therefore I make about $50 an hour processing my own film, vs. paying somebody else. Inital equipment outlay was payed for in less than two sessions, at that rate.
The big benefit is that I can shoot more. $50 bucks buys allot of 135.
On top of that, I do a better job, and am now more comfortable processing my own film, than having somebody else do it (hehehe I said "do it" hhehehe)
Except, of course, Mr Frizza. If you are where he is, you should just have him do it.