go with the Jungheinrich...
your operators may never know how much they appreciate the ergonomics, but the ones that have to drive the Raymond or Hyster, and then get a few shifts in the Jungheinrich (and get used to the differences) won't give up the Jungheinrich again, and will consider it a demotion if you make them drive the Raymond or Hyster ever again.
When you will be able to tell you got more work done in less time, with less operator fatigue is at the end of the day/shift.
when considering "operational cost" it is not only what the tires cost to replace, but how your operators take it when you ask them for 20 minutes work in the last 15 minutes of the shift, also.