Listen to them. Actually the best thing to do is listen to them in your car but that's probably not possible.
MB Quart a lot of people seem to like but their highs are really sharp and piercing. Personal preference but I don't really like them much.
Infinity is generally considered a good low end setup for people on a budget.
Don't know anything about Alpine.
And sensitivity ratings between manufacturers can't be compared, because different manufacturers will measure sensitivity using different methods.
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