Both of the suits that you are looking at have similar features. the Nex-Gen Pro Dry is a Bi laminate material (2 layers Pretty durable) and the BARE Trilam HD Pro Dry is a Trilaminate material (3 Layers more durable).
The Nex-Gen Pro Dry comes with a soft boot which is not ideal for walking on rocks or sharp surfaces, you would have to purchase the BARE Trek boot to go along with it $84.95 extra
The BARE Trilam HD Pro Dry comes with the BARE Boot (neoprene lined, Very buoyant) or you can get the compression-resistant Soft Boot plus the Trek Boot for an additional $84.95
Do you have any idea of what size suit you might need? If you don not fall into stock sizes then the suit selection will be easy. You would have to go with the BARE Trilam HD Pro Dry because you can get custom sizing.
BARE Nex-Gen Pro Dry
* LIFETIME GUARANTEE on seams and workmanship
* BARE's exclusive lightweight, waterproof Nex-Gen welded fabric
* Exclusive SWT construction
* Easy entry back zipper with internal protective zipper cover
* Screened graphics, reflective patch and low profile Si-Tech valves
* Bottleneck latex wrist and comfort-fit latex neck seals
* Delivered with compression-resistant Soft Boot
List Price: $1,049.95
DIVESeekers.com Price: $949.95
You Save $100.00!
BARE Trilam HD Pro Dry
*LIFETIME GUARANTEE on seams and workmanship
* Light but durable Cordura/Polyester/Butyl upper with a Cordura/Butyl lower
* Easy entry back zipper with internal protective zipper cover
* Premium reflective patches and low profile Si-Tech valves
* Bottleneck latex wrist and comfort-fit neoprene neck seals
* Delivered with BARE Boot, or compression-resistant Soft Boot
* Available in custom, made to measure sizing in North America
List Price: $1,799.95
DIVESeekers.com Price: $1,599.95
You Save $200.00!
As a Dive Professional for $100 more you can go with the BARE Trilam HD Tech Dry Front Zip, you might like the ability to get in and out of your suit by yourself!
Trilam HD Tech Dry
* LIFETIME GUARANTEE on seams and workmanship
* Durable Cordura nylon trilaminate throughout
* Self donning front entry drysuit with protective zipper cover
* Premium reflective patches and low profile Si-Tech valves
* Reinforced "critical-wear" seam points
* Bottleneck latex wrist and comfort-fit neoprene neck seals
* Delivered with BARE Boot, or compression-resistant Soft Boot
* Utilizes patented ATR system
* Available in custom, made to measure sizing in North America
List Price: $1,899.95
DIVESeekers.com Price: $1,699.95
You Save $200.00!
Oh yeah and 1 Option you should seriously consider is a "P" Valve. Dehydration is one of the biggest contributing factors the the onset of decompression sickness! Most Drysuit divers don't drink enough liquids because the don't want to have to pee. I promise you this will be the best money you ever spent. If you don't have the finances right now, it can be installed at a later date and it's easy enough to do yourself!
PLease let me know if you have any questions!
Cheers