I believe I answered that: 32 GB in dual channel may be better performance than 32 GB + 8 GB which would be only 16 GB in dual channel. You must decide if 32 GB in one laptop and 16 GB in the other will be sufficient for your needs. I cannot answer about ADATA vs. Transcend, as I have no experience with them. I did buy a lesser-known brand RAM, Kuesuny, for a couple of Dell laptops and it works well.  Anytime I buy RAM, after installing it I run memtest86+ for at least 8 full passes to thoroughly test the RAM. 
I recently purchased a Dell Latitude 5420, it came with SK Hynix 8GB. I want to add a 32GB card for a total of 40GB. However, I see 1Rx8. 2Rx8 and 1Rx16 cards in the market and the documentation is all over the place and confusing so I am not sure what would be the best choice for me from these rank selections in order to get the best performance. I sincerely appreciate any guidance in this regard.   [IMAGE]
RAM upgrade for Dell Latitude 5420