Most pro-dommes won't switch, or at least not initially. Maybe after you have seen them for a while and some trust has been built up. If you are ok with being on the receiving end, then it's probably the quickest way to get what you are looking for.
If you go lifestyle, remember that the domme is the one who sets the playing agenda. So if you are looking for something very specific, some will take offense that you see them as a do-me machine and drop you. Others are just batshit crazy...
Lifestyle is probably the best place to be if you are a switch, and perhaps cheaper, though kinky gear can cost quite a bit... a good corset can set you back the same as a 2hr play session, then if you add in quality cuffs, boots, etc (all for your goddess of course), it can get quite a bit. That's the investment aspect vs. expecting a pro to do all that with her dime and you are just buying her time.