In my experience body wood matters very little except with very microphonic pickups. Sure there are differences therein too, but, you can make a body out of metal, wood, plastic, anything works rather fine. Neck however accounts for about 70% of the guitar's vibrating mass plus it vibrates way more than body does because it is so thin. Many luthiers also will claim the same. I go one step further than most in claiming the body wood isn't even key at all - only mass and density distribution matters. Some manmade materials sound way better in guitars than wood does...and if you do want a body to have sound qualities, spruce would be my choice.
I have tested it too..if I put a mahogany body on my strat it sounds exactly the same amplified and just slightly different acoustically...but swap necks around with them stats and that makes quite a clear difference even amplified. I currently have two identical bodies with different necks and there is a clear difference indeed.
But, there are many aspects at work with these...my ideas are me ant as generalized averages. I don't doubt that some combinations may yield more differences than they generally do...some guitar could have a neck and pickups that exaggerate the body properties etc...it does happpen. But in most cases, I am sure swapping neck type on most any strat will make a lot more difference than swapping body material would.
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Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.