Try putting a decent amount of data in Ethereum for a few hours. You'll find out which platform is superior very quickly and hysterical people would say you are ddos'ing the network.

Ethereum is certainly capable of proof of existence, but that's not what it's made for and far more expensive to do, additionally you need to hold the entire ethereum blockchain just to simply access your data.

Does that sound appealing to your business?

Doing something once is easy, scaling it to enterprise level is an entirely different game. Plenty of promises by everyone in crypto, very few achieve implementation. PoS is still unproven yet everyone thinks its inevitable. Eth roadmap said PoS would have been done months ago and I don't think they are even close yet. Factom will get there, I don't mind how long it takes or where speculators shift their cash on the greatest new thing. In it for the long term.