In a surprising development the biggest Chinese Ethereum mining pool made the following statement:

https://ipfs.pics/ipfs/QmRpsTog5sk17q3GMTZxsn2FLGJyiHQFVLf3TqnfSHdnz7

Citing that the hard fork is rushed and controversial. The hard fork code has been released only 3 days before the actual hard fork date, which indeed is very rushed.
Lots of people think there is an overall consensus when it comes to the hard fork but there really isn't. On http://carbonvote.com/ there was a voting process that had only 13% vote against a hard fork, but considering only 5% of the Ethereum voted, that is too little to have a consensus. 

http://i.imgur.com/TgFLvmN.png

Also considering that the Ethereum developers want a hard fork themselves to bail themselves and their friends out and considering they have all huge amounts of Ether, we can assume that this is about as manipulated as it can be.

Only Poloniex is offering to support both chains at the start. Which was made clear in the following statement:

http://i.imgur.com/qsSj48e.png

Bitfinex and Kraken said they will only follow the most supported chain. I think however that Ethereum Classic might end up more valuable since it has shown resistance against censorship and a bail out.

Whatever you do, enjoy the ride and grab some popcorn.

http://www.reactiongifs.com/wp-content/uploads/2011/05/tumblr_ljh0puClWT1qfkt17.gif