Bottom line is one won't go wrong using either ADK or Studio Cat. I've used both.
1st - Years ago, after upgrading the motherboard in my DIY rack mount DAW, it wouldn't stay powered up. After exhausting my limited tech ability, I called Scott @ ADK and he actually agreed to take a look. I shipped him the unit and he basically used my components and rebuilt it in a new quiet, properly cooled case. Currently a little long in the tooth, I'm still using it today!
2nd - Because of the great service, when I began lusting for a laptop for remote work (& business stuff), I purchased from ADK again. Rock solid and still in use - 4+ years with only a small issue - originally used with a MOTU 896HD via Firewire card, the card slot became a bit finicky about locking the card in. Never lost a recording but became a concern. Now using a USB interface so no longer a concern.
NOTE: Scott, Chris, & Dave at ADK have always been great to talk to and ready to help in any way!
3rd - For my church I decided to use Jim to build our Sanctuary graphics machine (mostly due to the great comments here and Jim's always kind and insightful input in these forums. Now just after a year, we had our first anomoly when the machine wouldn't power up. I told my media guy who to contact and had a response from Jim very quickly. For whatever reason, an update to the BIOS/UEFI fixed it.
NOTE: He may be a one-man gig but I liked dealing with Jim. He is very professional, helpful, and like others have said quick and willing to help resolve any issues.
Again, can't go wrong with either IMHO