well, I am not a doctor, nor do I know you and the details of your situation, so take this for what it's worth.
I have had one highly successful cardiac angioplasty and stent implacement, and I have had one highly unsuccessful one. The latter turned into a situation of uncontrolled bleeding, tamponade (blood, and hence pressure, accumulating around the heart), which in turn led to my being rushed out of the cath lab and into surgery for an emergency CABG. Admittedly, this was while trying angioplasty to place stents in a CTO (chronic total occlusion - an old, heavily calcified, total blockage), and CTOs are often referred to in medical journals as the last great unconquered frontier in PTCA (in other words, higher risk then PTCA/stenting of an acute or a partial blockage).
Angioplasty and stents can be as successful a procedure to releive angina as CABG - I really don't think the issue is whether one or the other is more or less able to relieve your symptoms.
Both are subject to similar long term risks - failure of the reopened (or bypassed) blood passage by continuing progressive CAD. So aggressive measures (diet, activity and lifestyle as well as medications) to control, stop, or even reverse the progress of CAD is a must.
The risks of the actual procedure are quite different though, and the CABG looses out on that score (mainly, to my mind, due to the increased risk of infection - a concern in these days of ever less effective antibiotics). Also, recovery from CABG is a much longer and a much more unpleasant experience than recovery from angioplasty (especially when it is a scheduled, prepared-for procedure - my first one was while in the midst of a heart attack).
However, the decision is affected by so many variables unique to each persons specific health issues and such, that it's impossible to make any great generalizations.
If it were me, and the blockages were good candidates for stenting, I'd choose that over surgery. A stented artery can always be bypassed in the future if problems continue or arise anew. While a bypass can also be stented, should it fail in the future, the choice for a first course of action still would be clearly on PTCA and stents in my mind.
Good luck with whatever you decide. Just remember that neither procedure is a cure, just a treatment. So be sure to talk with the docs about diet, lifestyle, exercise, followup medications - everything you need to be doing to make the stents or bypass remain effective for a good long life-time.
P.S. I'd also want a consult with the surgeon who would actually do the CABG. Ask him whether he plans on using a vein (usually the saphenous vein from one of your calves), or an artery (usually the internal mammary artery). Long term useful life span (patency) of mammary artery grafts appears to be much better/longer then vein grafts. Also ask him whether he would be using a heart lung machine, or one of the minimally invasive techniques which do not require the heart to be stopped - the two approaches have their own pros and cons, so have him go over them with you. Have a consult with the interventional cardiologist who would be doing the PTCA as well, if you can. Ask him things like, does he have a straight approach to the sites of blockage (blockage in the curve of an artery, or at the jusction of two arteries is much more problematic), how long does he estimate the procedure (the radioactive dye used can cause liver toxicity problems if exposed to too much of it, or for too long).
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