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Which Arduino board has the most amount of space?

Which Arduino board has the most amount of space?

Why don't you go look at the Products link on the home page. Do your own research.

Here is the information you are looking for or at least a pointer in the right direction; List of Arduino boards and compatible systems - Wikipedia

Cheers!

PS: Don't forget to donate to Wikepedia. Support open information. DS.

My unofficial '1284P board has 16K SRAM, I'd call that the most, unless you needed a ton of flash. A shortage of SRAM seems to be a more common problem than a shortage of flash.
I'm waiting on parts for 25 more kits ...
http://www.crossroadsfencing.com/BobuinoRev17/