I have grown citrus in the past and have noticed a big difference on trees vigor and resistance to insects, yellowing, leaf curl, leaf miners, etc. From my observations the following citrus never really got hit as hard in the garden during the same time frame of leaf miners etc.
I have found the following to be have excellent disease/bug resistance; Yuzu, Australian Finger Lime, and Kumquat. Would love to hear what others have experienced as well.