The major difference is all factory-made stocks are thick, bulky, and heavy. The TS1 offers the versatility and comfort of a hunting stock - slim forestock and butt, light, and fully adjustable to the shooter. I've had HS Precsion, McMillan, etc. They don't come close to the portability and ease of use as this stock does. For me being comfortable in any position is better than just a good bench gun. As far a price, you're getting a taylor-made custom stock. Suck it up!
You can get McMillans with various fills and make them fairly light. I for one, hate slim forestocks, not to mention the angle of the grip on the TS1 looks terrible for MY taste, as everyone has their own preference. To spout these features as benefits is incorrect, they're your preference.
Doesn't sound like the OP is looking for a hunting style stock. I recommend handling both and see what you like.