Hiya razorback1 and thanks for your thread. And seems the operators chiming in are all for ya to try the TSO. Think some of the considerations are where exactly are you with finances and if you are able to afford the loss in investment on your Shadow 2 in order to finance the TSO purchase. Add to that, you realize that making your S2 even sweeter in custom work would approach what a TSO costs. I assume you are thinking of adding 400-500 of custom work making your 1200 investment a 1600-1700 investment. If I understood your initial thread.
You have had the S2 a short bit and love and enjoy it. Its features are improvements on several platforms beneath it in cost. A short reset/trigger work can decrease its 9lbDA and 4lbSA,but would the cost give you a percent increase in enjoyment and love of the gun,prolly not. It certainly won't increase your cash return once selling it. There is truth to the adage,if it aint broke why fix it.
Suppose its also good that you acknowledge the TSO is a different combo of frame and barrel. And comparisons are apples to oranges,so to speak. I can't afford a S2 or a TSO,but if I could,personally would like the TSO as I prefer SAO,2lb trigger for a range toy,and the shootability,accuracy,a heavier gun with a longer barrel can give. I kinda even like the chunkier grip it has. Doubt you'd find one at a rental counter,so barring a mate letting you shoot one,only then could you decide if you like it as much,or more. If money is not an issue,get one and see, maybe you will enjoy taking them both out on range days.
The TSO is an "new and improved" tactical sports,which was discontinued last year,and it used to be the Champion. Perhaps you might put a gently used tactical sports on your list which at 700-800 bucks can be found. I saw a forum member selling a TS upper that was customized to fit on a TS lower as well as a shadow frame. In a sense a close second to what a long-slide is. A pairing of shadow and TS which I also enjoy shooting at the range with.
So sorry we can't tell ya which decision you would be happier with. Just be happy with the choice you do make. Kinda like buying a new car, we don't want the enjoyment of new ownership dampened with the knowledge of the depreciation that occurred when we drove off the lot. That will rear its head when we are needing to sell it at some distant point in the future. Cheers,be well.