Sinkable above ground pool vs true built-in pool

I'm looking at a fully sinkable pool (52" Rockwood) vs a true built-in pool. The Rockwood has a lifetime warranty, but my pool guy is telling it's poor quality. Of course, he's trying to sell me the true built-in. Any advice/suggestions you could give re: sinkable pool vs a true built-in? Thx.
 
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