I commend the discussion by all and the moderator for keeping this discussion objective. So this is the proverbial question, quantity vs. quality when deciding between the PM949 and the PM950. Even with the same specifications one also needs to factor in the specific models available at the time, as I have seen wide variances between models made by the same manufacture, and even for the same base model sold to different vendors. There are also sourcing changes for the same model number. Both mills described will have very similar capabilities, and so the difference are more likely tactile as opposed to features (other than the accessories). There may be slight differences in the allowable tolerances, and no doubt finishes. Having helped a number of fellow hobbyist in the conversion of their lathes and mills (935 and 949) in VFD conversions, and also had hands on with a number of local machines, I have gotten some feedback from their owners as to their impressions. I also have been through a few machines, so have limited, but tangible comments on the subject.
So up front, I would say 99% of the 935 and 949 mill owners I have interacted with over the last 4-5 years have been very happy with these mills, most recently [X]Outlaw who purchased the PM949. I have not heard of any reliability or concerns as to the fit/finish with either the 935/949, and if anything most have been very impressed. I have no direct experience or heard any feedback with the 950. I have and do find as a general rule that fit/finish/tolerance of the same size/type Taiwanese machines to be better than those made in the Chinese mainland, and you pay for this. Even within the same manufacture there could be wide variations between the same base model based on the vendor specifications and cost points. Unfortunately for most of us, it is usually the case that a hands on/eye ball assessment is not possible, so we rely on other's experience's to guide us as too our choices. This also needs to be taken with a grain of salt. I also recently was faced with the same questions when upgraded from a benchtop mill to a full size knee mill, so also had to go through the same decision tree as to vendors and models. I had the option of getting a more fully accessorized mill at the same price, but at the end of the day it was the quality and the ability to get parts/service that governed my final purchase.
My recommendation would be in this case, given both machines have similar capacities, would be to opt for the PM949. This is based on the current model and the comments by several other owners of this mill. My own experience when I recently upgraded to a knee mill (LCM-42) and current lathe (1340GT), both of Taiwanese origin, is that there was a very tangible difference in that you get what you pay for. I am very happy with both, and a world of difference better than what I had previously. Other factors that had a significant impact on my decision was warranty and post sales support.
So it comes down to budget (as usual), features and your needs/preferences. In most cases, for the same size machine regardless of origin/manufacture, it almost always comes down to the user's proficiency as to producing the final product. Given that costs are not miles apart between the 949 and 950, one can always save and buy accessories at a later point, funds permitting. Based on my past experience and current, at least for me, I have opted for the better quality tool/machine vs. more bells and whistles. In almost every case where I have purchased a lesser quality/cheaper item(s)/machine, it has been replaced at a later point and I paid significantly more in this 'learning" process.
