Both are too new in the market for any to have tried yet. But based on the old versions of EMM compared to AA, I would recomment the latter. Firstly, the chassis of the AA is a solid piece of aluminium artwork compared to EMM industrial cheaper look, so you know which one looks more grand and appealing at that range of pricing ;-)
Soundwise, you would have read by Teajay's detailed review on how AA Tube DAC2 eats up other brands of DAC many times its price. Furthermore the performance of AA Tube DAC2 can be further improved by upgrading the manufacturer provided stock tubes with much better NOS tubes like Mullard, Amperex etc. You cannot improve the performance of an Emm DAC once you get it... unless you modd it.
Soundwise, you would have read by Teajay's detailed review on how AA Tube DAC2 eats up other brands of DAC many times its price. Furthermore the performance of AA Tube DAC2 can be further improved by upgrading the manufacturer provided stock tubes with much better NOS tubes like Mullard, Amperex etc. You cannot improve the performance of an Emm DAC once you get it... unless you modd it.