Tensile strength is largely irrelevant in the range of V-Strom horsepower.
However, it is sometimes one indication of a higher quality and potentially longer life if you're looking at a reputable brand name chains.
If you're looking at cheap no-name Chinesium chains on fleaBay, then the tensile strength numbers are meaningless because they're just made up anyway.
In general, I've found that if you stick with good x-ring chains from known name brands (Regina, EK, DID, Sunstar, RK, etc.) you'll be fine. There are a few "house" brands that aren't too bad.
Personally, I prefer chains with a gold finish because they resist surface rust a lot better, and the shiny gold makes it easier to tell when it's time to clean and lube the chain. My bikes are generally filthy other than nice shiny chains.
To be perfectly honest, I've noticed that chain lube brand, type, or regimen doesn't make a lot of difference as long as you do... something with the chain every so often and run it slightly loose. If you live in a very dry climate, doing nothing with the chain can be a viable option, but for the rest of us forced to ride in the rain sometimes, it helps to have some sort of substance on the chain to protect it from moisture and help prevent surface rust.
2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
2005 KLR685, Aztec Red - Turd II.2, the ReReTurdening