Which hardware (video i/o) are you using for external monitors for color grade and client monitor

What I am talking about are playback/capture cards such as Blackmagic, AJA, Bluefish, etc. I am using Premiere in a professional environment with proper calibrated monitors (Flanders DM240 for color, LG C2, C3 for client). My Blackmagic Ultrastudio 4K no longer works properly in Sonoma (apparently no longer supported although works perfectly fine with Resolve and Sonoma). So I am looking at a replacement. I have often found that Blackmagic hardware with Premiere and FCP results in a bit of lag/slightly sluggish from the time you hit play to the time it actually plays. I like instantaneous playback and stopping on a precise frame while editing. Is anyone using a professional setup like the one described above with a piece of hardware they are very happy with. My gut instinct is telling me it might be something like an AJA T-Tap Pro. 

I am on a Mac system, so would really prefer feedback from those who are running similar systems. I know these types of things can be very much based on platform, so what might work on a PC may not work as well on Mac or vice versa.

Also, if anyone has insight into things like video/audio sync delay (not clip based sync but playback sync between video and audio that can sometimes need compensation built in when using extranl monitors, which premiere does allow you to set offfsets for) with various hardware, that would be very helpful too.

Thanks!

Steve