Combine the canola oil, olive oil, seasoned rice vinegar, red wine vinegar, Dijon mustard, sugar, garlic, sea salt and freshly cracked pepper, to taste, together in a small bowl; whisk until well combined. Set aside for the flavors to mingle.
Remove the wooden ends from the asparagus then cut them into thirds. Boil a small pot of water, add the asparagus, then cook for 1 minute or until crisp-tender. Drain from the hot water and place into a bowl of ice water for 30 seconds. Remove from the water and place on a paper towel to drain.
Add the sliced tomatoes, asparagus, and diced avocado to a large bowl. Tear basil leaves and throw into the bowl. Drizzle with the vinaigrette, to taste (you may not need it all), then toss to coat evenly. Sprinkle with feta cheese. Serve. Enjoy.