So far he has made Qora look really good. lol
Qora is based on an early version of Nxt code which was already a software in production. Exo is a brand new innovative software with a brand new architecture. Qora guy is good at programming (meaning better features). Exo guy is good at crypto architecture (meaning better or unique foundations). Which one will you value more? It seems that some ideas of Exo have been borrowed by NEM and Crypti (the idea of rating nodes).
There is no evidence on Qora being based on NXT> a guy who performed disassembly to the code noticed this. Also Qora is the first crypto with a name exchange and voting system with such abilities. eXo is great too, but please do not underestimate Qora