I don’t know what your typical projects are with Adobe which will determine what you need and if “time is money” factors into your equation.
I build my own systems because they offer the most flexibility and can be very specifically configured for the tasks I want them to perform.
Dell/HP use proprietary components and any failures means you have to go to Dell/HP and wait for parts and pay a premium for those replacement parts. For example motherboard and power supply in the Dell/HP are non-standard and can only be replaced by going to Dell/HP.
The Lenovo is a little better because they use less proprietary components. But they don’t use the “best” components, for example their RAM timings will not be top tier (RAM speed is VERY important for Adobe), their UEFI/BIOS configurations will not be optimized for best performance, minimal rated power supply (poor transient response).
Mac … well, I wouldn’t consider anything less than the Mac Pro for video/audio workflows. A few months ago I priced out a Mac Pro well equipped for video/audio work and it was around $18,000 US (and that was the now old M2 processor).
I’m primarily a DaVinci Resolve/Fusion user now but occasionally work on Adobe projects (not on my dime as there is no way I’m paying Adobe subscription prices anymore). I run 4 computers and run headless Resolve/Fusion workstations for projects I can run in the background while I continue to work. As I pointed out in another thread, I’ve never needed more than 64GB RAM but I do buy the best RAM timing options available for 64GB (2X32GB modules DDR5). Also very important is your network performance if you have external storage (NAS) or computers to do processing … I run 10GbE network and looking to do some Trunking (pair up some 10GbE ports) to get 20GbE all via Cat 8 RJ45 (SFP so fiber is an option but Cat 8 is good to 40Gbps).
My typical media sources are 4K – 60 RAW HDR (but not always) … on the audio side 6 track recordings but often just 1-3 tracks.
But important to know a key factor … you need to provide the “time is money” factor. If not, then any of those options you listed will work, just more slowly … for example if you have a project that take 1 hour to render out in one of those computers, on a faster computer you could easily drop that down to 15 minutes. If you do this day in and day out, that’s A LOT of time saved (or time earned pending how you want to look at it).
Cheers, Rob.