Sorry if this is posted in the wrong group...  I am seeking advice on a new purchase. 

My workflow:  I am a photographer by trade. I require speedy throughput, I copy and move up to 4000 images weekly.   I process large 40gb+ image files using mostly Adobe Photoshop and Lightroom Classic. Currently very little video or 3D rendering. I use multiple internal SSDs and variety of external SSDs, and I run 2 external monitors. 

Sales initially recommended XPS-17 9710.  But this setup just throttles the machine config'd with i9 and NVIDAI GeForce RTX 3050 Ti., below: the current XPS which has stability connectivity issues and limitations, both with and without the dock (WD19DCS). 

Sales now recommends this 7760 17" mobile workstation with XEON processor, (retail pricing $11k) 

Dell Mobile Precision Workstation 7760 CTO 210-AYYC

Intel Xeon Processor W-11955M (8 Core, 24MB Cache, 2.60GHz to 5.00GHz, 45W, vPro) 379-BELS

Thermal For Graphics 490-BGQS

NVIDIA RTX A5000 w/16 GB GDDR6 490-BGRC

17.3" IPS UHD, 3840x2160, 120Hz, Anti-Glare, Non-Touch, 100% Adobe,500 Nits, HDR400, IR Cam/Mic,WLAN
391-BFZQ

64 GB, 2 x 32 GB, DDR4, 3200MHz, Non-ECC, SODIMM 370-AFXT

M.2 2280 1 TB, Gen 4 PCIe x4 NVMe, Solid State Drive

My questions:
1. Is the XEON processor or CORE i9 better to support my workflow?
2. With XEON processor, is ECC memory required to suypport error correction?
3. this the i9 processor a good alternative, or is this less powerful machine:

11th Gen Intel Core Processor i9-11950H (8 Core, 24MB Cache, 2.60GHz to 5.00GHz, (45W), vPro)

with 64 GB, 4 x 16 GB, DDR, 3466MHz SuperSpeed, Non-ECC, SODIMM 

Anoyone have any advice would be much appreciated... Any photographers out there??