Let's look at time commitment which is about all that I'm qualified to evaluate: With CRNA you are looking at about two years from the time you are an RN to gain the requisite experience and BSN to apply (some schools
will take a BS/BA in a different subject instead of BSN). Then you are looking at from 24 to 35 months in CRNA school. Thus you are talking about five years from the time you are an RN to be a CRNA. You will probably start out between 100 to 140K in most locations. Depending upon how aggressive you are in pursueing higher paying jobs, and how willing you are to work call and move to various area's of the country you will probably "max out" at around 200K per year (potentially double that if you are willing to go into private practice in a group).
Now lets look at the MD route. You would probably STILL want to get your RN (that way you've got something to fall back on if medical school doesn't play out). However, you may or may not choose to get a BSN (you would be more likely to go ahead and get the BSN IF you wanted to keep your options open with regard to becoming an NP or CRNA). However, you would definitely have to take some extra classes to be serious medical school material which would include things like General Chem I & II, Physics I (maybe II), Organic Chem I& II, standard comparitive zoology, Biology I&II, Microbiology (generally a different section from the one you might have taken as an ASN prerequistie) genetics, and many medical students are now taking Biochemistry (after the two semesters of Organic). Thus, you would be looking at about 18 months of classes after your BSN (actually you would want to take these classes BEFORE getting a four year degree so that your financial aid didn't go "poof"). Then you would take your MCAT (at some point about a year ahead of when you applied for medical school). Once in medical school your looking at a standard four year program (including your internship). Most anesthesia residencies are three years, but to really be competitive your looking at more like a five year residency or a three year residency plus a two year post residency fellowship. Thus, your time investment would be about eight and half to ten and half years from the time you got your ASN degree. You would probably start out at around 120K to 150K. However, you would probably top out at around 500,000 thousand, more if you went into independent practice.
Thus, the YOUNGER you are the more sense the MD route makes. Also, getting a degree other than a BSN wouldn't cut much off of these estimates because of the EXTRA biology or chemistry classes needed to get degrees in those subjects. I think you would be well respected in either profession, but obviously nothing tops being an MD. Also, you could conceivably specialize in difficult anesthesia situations as an MD. However, you malpractice insurance
could be much higher. I cannot evaluate this aspect of the decision.