I've done a number of daysails on a 34, a 2 week trip in the Sea of Cortez and a month long trip from La Paz to Isla Soccoro to Zihuatenejo.
I have owned Crazy Fish a Crealock 37 since she was dropped in the water in late 1989.
They are very similiar boats.
The 37 has more storage room and I think the layout is better, particularly the aft end of boat and cockpit.
One thing I wish the 37 had that the 34 has is the shallow cockpit locker over
the quarter berth. I would modify it to make a section of it a bit deeper to custom fit a liferaft into it.
To me the 34 feels like a cramped 37. '
Friends (2 boats, 2 couples) who had purchased 34s would have purchased 37s if they had a redo.
Personally for the same amount of money I would go for an older 37 over a newer 34. My main concern about an older boat would be hours on the diesel. I would assume that in the course of my ownership I would replace the sails, electronics and probably the rigging.
On Crazy Fish I replaced the Datamarine Electronics with B&G network system in 1999 and last year I installed a B&G Triton System. Need to replace dead Raytheion Radar (probably a 4g radar),a dead Kenwood TS-450 ham radio and Pactor 2 modem with an Icom M802 SSB/Ham radio and Pactor 4 modem. VHF Radios need to be replaced with DSC radios and need to add a AIS transponder.
A few sails purchased over the years but last 2 years ago I replace the jib and will probably replace the main this year. Will also be looking a Code 0, Code 1 sail this year after adding a spinnaker last year. Cruising spinnaker has been on board for a few years.
I have had 2 dodgers built for the boat but was not happy with either one and I am quite happy sailling out of San Diego without one currently.
Rigging was replace 2 years ago with Dyneema Dux.
You are probably going to look at all of these replacements when acquiring a 34 or a 37 as its been a while since they have been produced in any sort of volume.
But value has held up as the boats are still in production - Pacific Seacraft will build one for you and are still a viable company/brand despite the bankruptcy of the Fullerton based corporation. The new company is a great resource. Thumper at Pacific Seacraft has been a great help for a number of upgrades (i.e.. replacing wheel with tiller).
They are great boats
Crazy Fish - Maintaining, Upgrading and Sailing a Crealock 37