Meguiars M21 2.0 vs Wolfgang DGPS 3.0

I've used M21 2.0 on every car I've done, no one has had an issue. It doesn't last as long as I'd like, but for the price, I can't complain.
 
M21 was my first sealant. I used it for one year before switching to WGDGPS and there is no comparison. WG wins easily.
 
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