love bore tech, works great, never tried Thorro Clean.
after doing a bit of reading, Thorro clean appears to be abrasive, made by Iosso. I personally prefer not to use abrasives if possible.
Looking on Midway there is also a fair bit of a price difference.
Thorro Clean $5.37 per oz
Bore tech eliminator
4oz $4.75 per oz
16oz $2.06 per oz
I will stick with Bore Tech. Also need to try the Lucas extreme duty stuff. the oil and grease are pretty good. a CLP for field use is a good thing to have too,