Love my 210g. The height makes it a great display tank (but be prepared for wet arm pits). 2' wide is a minimum for me now with reef tanks (whereas the 126g is probably only 18"). You'll find aquascaping is harder when only 18" is available.
Drawbacks. For a reef, 250w vs getting away with 175w or 150w if you go MH. Lots more Live Rock to buy.
If cost of outfitting the tanks is not a factor in the decision-making proces, 210g is the way to go.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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