TDS= softer with better elasticity, bonds very well to itself in the event you need to make a repair / change. Sands well, in a larger seem taping the bottom with fine line tape helps eliminate the thermal exapnsion issue and opening of side seams. A couple hundred tubes used trying to save my old wood deck
Sika= If you use the Sika primer it has excellent adhesion, however, does not sand as well as TDS, is considerably stiffer and does not blend as well when making a repair / change.
Plus one for TDS
Buy a cheap
cordless caulk gun!!! Or a good 3M hand one and do a test run on quantity, you a want to ensure a full seem with no air entrapment and will end up with some waste, I would not recommend the frugal temptaion to putty the exess else where I learned that the hard way. No air and slightly over filled sands out to be very nice. under filled areas really show up.