Yes, i currently stay at Damansara Avenue, thats why I get to share many things I am experiencing here now. I used to stay DPC.  When it come to accessibility and traffic jams, It all depends on where you are heading. If you use MRR2 or Jalan Kepong , or head to Sungai Buloh, yes, there will be perpetuals jam at most hours. If you come from DUKE2, yes there is that interchange section bottle neck, but thats only an added 5 min or merging traffic, over that flyover, its all clear at most time of the day.

But if you plan a trip to KL, or to PJ or to Sungai Buloh (from DA) , never use MRR2 or Jalan Kepong. There are better alternatives.
To get onto DUKE 2 to go to KL, better use the U turn and use the alternative route through DPC/Menjalara. The Decathlon exit to DUKE 2 should also be quite smooth

You could also opt to use the small roads at Mont Kiara and end up in Sprint (depending on time of day)

I've not used MRR2/Jalan Kepong for a long time. If you use MRR2 ort Jalan Kepong to get to DA, expect KMs long craziness during most times of the day, esp rush hour
Vis a vis, the jam for DA is rather tame if compared to the peer jams at Damansara Perdana, Ara Damansara, Bandar Utama or even DPC nowadays. At these places you will have a traffic jam at the doorstep.

One reason DA is still not that bad is because density at BSD is still not very high, but might change with the many new condos coming up

The developer is saying they will have new roads and exits introduced soon for the DA master development, so that we will not have to all be bottled up at the current BSD exits.  You can visit the show room and see their masterplan scale model. the roads shown are pretty much what the developer have submitted to MBPJ, approved, to be built in stages

DPC entry price is much higher
DPC even higher price bro, made even higher by speculation, flipping and  further inflated by DPC resident's first dips and late-to-the-game aspirants jacking up prices even further.

DPC is also gonna be running out of lots to build cheaper options, so its going to be even sky high henceforth, as all new development will be targeting up market. Lower priced options will snapped up by the first-dipping residents and then jacked up .
In fact the DPC developer has changed the master plan so many times to squeeze out more lots, and generally the JMCs will support it, because they have access to first-dips profiteering off the FOMOs and late-to-the-game aspirants trying to buy DPC because of buzzfeed.

I guess the key differences between DPC living and Damansara Avenue living:-
1) Compare Sri Damansara locale environment and feel vs DPC locale environment and feel
2) Damansara Avenue is integrated, sheltered pedestrian friendly lifestyle vs DPC is somewhat pedestrian friendly under the sun, or best use the car
3) Relaxed vs Crowded
4) MRT/car vs car

Similarities:
1) Both DPC and Damansara Avenue enjoy the best of Malaysia, with residents spoiled for choices, ranging from upscale offerings to cheap eats , esp with easy car/MRT access and multiple options to reach Kepong, Menjarala, PJ, Mont Kiara, Sungai Buloh, Hartamas, Damansara etc.

2) Generally less jam or choke points vs any other KL or PJ condos location getting in and out of the house. Bandar Utama is less than 5 min drive away outside of rush hour. Even Genting Highlands is easy access with the least jams and bottlenecks. We are spoiled for connectivity choices to KL, PJ and beyond. Though DPC rush hour jam is obnoxious. Damansara Avenue may try to avert this via multiple exit, entry access points in and out of the integrated masterplan.  Can reference the scale model. Apparently, Phase 1 is committed and set in stone.

3) This area of KL has more room to grow vs PJ, esp when Kepong is experiencing generational growth in spending power and lifting earning power. The LDP toll is protecting this area of KL from PJ exorbitant prices . So getting a shop here is    cite the growth experienced by Kepong and Menjalara. And the dearth of shopping malls serving this side of the toll. Business potential.

4) both Damansara Avenue and DPC has the same zipcode 52200, Kuala Lumpur. Despite Damansara Avenue being Selangor and managed by MBPJ. There are advantages here if you know how to play it.

5) Also Kepong / Kota Damansara / Damansara Perdana with its swaths of leasehold land https://ipropfans.com/freehold-and-leasehol...-petaling-jaya/ , means that the property prices in these will be forever lower/less attractive vs DPC or Damansara Avenue for aspirants looking in this vicinity, making these two areas premier spots for properties close to KL/PJ hubs