I switch back and forth between the two, depending on a few factors. One big consideration is how many flights they have to that destination. The airline that goes more often has more options if something goes wrong. If that is pretty much equal, I choose based on price and/or flight times.
The last time I had a problem with Air Canada (my flight was cancelled) they were very helpful. Their new schedule for me didn't work, I called in and they offered me several other options, I said I wanted to think about it, and called back the next day. Got through quickly on the phone, had polite service, and no issue getting the replacement option that worked best for me.
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