Gently mix the tomatoes, avocados, onions, arugula, and half of the vinaigrette in a large bowl. Check for seasoning and add more vinaigrette, if needed. Sprinkle the cumin and cilantro over the top and serve immediately.
Vinaigrette:
Whisk together the lime juice, vinegar, honey, cumin, and cilantro in a medium bowl. Gradually whisk in the oils until emulsified. Season with salt and pepper, to taste. Do not use a blender to make this vinaigrette.