Recently went through the same comparison between the 135 and 429.
Pretty tough to get a new 429 for less than 6 million.
IMO, it would be a good idea to let the 429 platform mature for a few more years.
That said, both are good machines - but we decided on the 135- mainly because of the poor support we received from Bell on our previous machine. Hearing a lot of horror stories lately about the "award winning" support that Bell is supposed to be known for....and we operate in the same country where the machine is built.
The support from Eurocopter has been very good on the 135P2e.
BD