If you primarily use Lightroom/Photoshop, then you should read the information on Adobe's websites about GPUs. You will want to get a GPU that meets Adobe's recommendations, although which exact brands an models are not listed by Adobe. Start here, and follow linked articles where appropriate:
https://helpx.adobe.com/lightroom-classic/kb/lightroom-gpu-faq.html
Adobe also mentions which processes do, and do not, use the GPU. It's rather tedious and confusing to read what Adobe has to say, but it is probably more useful than the kind of anecdotal recommendations you are likely to get on a website like this one.
On my Lightroom Classic v6, I checked Preferences>Performance. The Use Graphic Process box is not checked. Should I check it? How does one determine that you should? Here's the configuration.
Lightroom version: 6.14 [ 1149743 ]
License: Perpetual
Language setting: en
Operating system: Windows 10 - Home Premium Edition
Version: 10.0.19043
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 3.3 GHz
Built-in memory: 24527.1 MB
Real memory available to Lightroom: 24527.1 MB
Real memory used by Lightroom: 681.2 MB (2.7%)
Virtual memory used by Lightroom: 793.1 MB
GDI objects count: 664
USER objects count: 2393
Process handles count: 3461
Memory cache size: 176.2MB / 5875.7MB (3.0%)
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 171MB / 12263MB (1%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1920x1200
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No
Graphics Processor Info:
AMD Radeon(TM) R9 270
Check OpenGL support: Passed
Vendor: ATI Technologies Inc.
Version: 3.3.13476 Core Profile Context 22.19.172.769
Renderer: AMD Radeon(TM) R9 270
LanguageVersion: 4.50