I realize this is a old thread but I use Aura or Regal Select for all my interior projects. Although they are both high end paint plus primer paints and they are both Green Promise Zero Voc, there are two main difference between Regal Select and Aura. First, Aura is self leveling where Regal Select is not. Because Aura self levels, it sets up fast which does not allow for it to be back rolled. If rolled correctly Aura will give a much smoother finish because of this feature, however if it has been back rolled or over worked, then you will get patchy spots. The second difference is that Aura was designed to use with any Benjamin Moore full spectrum Colour Stories Palette colours. These colours do not have any black or gray tints which causes the colours to change from room to room and in different light, hence the full spectrum. CSP colours can only be mixed with Aura paint. Aura is my favourite interior paint, but it's not for everyone because it sets up very fast. Adding Floetrol can extend the open time but you still need to get the feel of Aura to get a flawless finish. Aura can be tinted to any Benjamin Moore colour but it does tend to colour shift more than Regal Select. Depending on what the clients colour choice and home style is will determine what I recommend. Aura is best for CSP colours, sun walls and bright stairwells for a smooth finish and it has slightly better coverage than Regal Select. Both are highly cleanable when cured.

Regal is the original formula; Regal Select is in the Gennex line with the 0-VOC colorants. I believe BM's point in applying the trusted Regal name to the a Gennex line was to say that the paints are apples-to-apples in a sense, telling Regal fans they could expect the same quality from Regal Select but with lower VOCs. Going out on a limb here, but it sounds like paintguy gets a contractor discount and that they give him a better deal on the Regal Select. In my town the Regal and Regal Select are sold at different stores, but they're both around $50. Of the two lines, I've only tried the Regal Select in matte, but I've been happy with the coverage, low splattering, lack of drips, attractive finish and durability. The RS has a high solid-to-liquid ratio, making it thicker than other paints I've used, but it still applied nicely, not glue-y. It's interesting to hold a can of Regal Select in one hand a can of a different paint n the other hand. RS is heavier (which makes me wonder if Aura is even heavier and thicker?).

I just finished painting my finished basement. I used Regal Select for the first time. I used the eggshell finish for the first coat and found it shinier than the Regal. I switched to the flat finish for the second coat. The flat is closer to the Regal eggshell. The Select is thicker but it doesn't have additional drag. Drying time is a little shorter, and a little less smell. Since it is only $3 more per gallon, I will continue using it.

I don’t know how it compares to your paint, but I have BM Aura in a satin & semi gloss finish in my house. It’s some of the least scrubbable paint, especially for the price and considering the sheen level. I can’t imagine anything matte or eggshell by them. I found the Valspar I used in my previous house to be much more scrubbable. I know there are a lot of BM fans out there, but I have not been impressed by my experience with their paint at all.