I think both coins have their place, but what excites me about DeepOnion is how new it is - just started in April of 2017. Lots of stuff coming out this year like mobile wallets and DeepSend, which is what will obscure the transactions beyond it just running on TOR.

I've got nothing against Monero, but I see Onion as a great community with a better upswing percentage-wise on the price.