Short assessment based on playtesting.

You cannot properly evaluate both machines together at this time, it is a bit premature.

GB (and especially the premium/LE games) has not been released. The code was incomplete and kinks were being worked out on mechanical design for production.

TH has its own share of problems that were not addressed in the lengthy design period, and has given private buyers and operators the "jitters".

As it stands right now, it *looks* like GB will push TH into second place based on "fun factor", code completion, and gameplay including considerations such as mass appeal under the production run even if the general public are not old school GB fans.

JJP has some work to do in order to gain back some of the current ebb of interest, and start cranking on the code, address a modification kit for stuck ball areas, and ramp protection. If not, I see my prediction becoming reality, even if the GB code is a little shaky, because it really is dependent on how noticeable the issues may be overall to average non-pinball players not just collectors.

There has been a rapid spike in sales/brokering of secondary market WoZ of every version since Christmas.
Collectors/buyers are not holding onto them, some still trying to sell them at near NIB cost.
NIB sales have stalled for remainder.
LEs are popping up all over the place, but I do not know if private sales are all being successful, as there is not enough data yet.
Operators continue to not be particularly happy about maintenance requirements either.

The code did not save the game from waning interest, not that it does not have the Roadshow "wow factor" from the 1990s.
TH may follow in the same suit, but not entirely due to code.
People can be a JJP fan, but unless something dastardly happens with GB code and mechanical feature implementation of Premium/LE units, the title is going to going to get out in front of the pack quick.

Here are FIVE WoZ (higher end models) listed in the LAST WEEK by quick search all over the country.
They are all USED machines:

http://goo.gl/fxX5t5 - Seattle
http://goo.gl/JbWbSH - New York
http://goo.gl/VPs6Lk - Atlanta
http://goo.gl/qGBpDL - Chicago
http://goo.gl/1QGPBD - Philadelphia

3X LE and 2X Ruby

This is not in consideration of dealers or brokers that have bought more for resale, or the list becomes larger.
This does not consider other sources of sales either like Ebay, WPC Forums, Mr. Pinball, etc.
Prices are what they are, that was never my quoted observation.
No one would want to sell them for some type of huge loss anyway.
Private owners are selling for whatever reason, my guess is they want a new shiny toy whether a GB pinball machine, car, motorcycle, or just outright pay their bills.
Ruby Red and Standard are available from most JJP distributors in small quantities.

I am not crapping on JJP, this is just the secondary market.
There has been more than an average turnover of this title in comparison to some titles in the past four months.

This is slowly becoming a standard pattern in the hobby where new collectors keep dumping new titles for another new title, or they cannot afford what they already bought. Higher than average from the past as well.
I had a discussion with a broker/distributor about this same topic today.

Maybe TH and GB will follow the same suit, maybe they will not.
Neither is in a position to be properly judged yet anyway.