I beileve everyone in this thread is "right" to some degree.. If you are talking about solving poker as in "playing a game theory unexploitable strategy", than poker is definitely a simpler game than chess. If you are talking about "beating poker for the maximum amount by exploiting people's tendencies", than poker is more complex than chess..
Also for humans, one game could be "harder" for one person and "easier" for another person. Some people just don't have a good personality for poker and some people don't have a good personality for chess. A couple years ago Hikaru Nakamura was trying his luck at PLO.. He came on ICC and told me how he won like $1000 5 straight days. Then the next day he came on and told me how he's never playing poker again
.. He definitely finds chess easier
.