Allan, the resonant heads should be changed about every 2-3 times that that batter head is changed - Rule of Thumb. As with any stock head vs. better quality head, there will be a difference. As to the type to get, it depends on the sound you want from your drums. The more you want your drums to "sing" (open sounding), the more you are moving toward single ply, and thinner. The more controlled you want your sound, the thicker your head will need to be.
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