Thicker oil should provide better moft and thicker film and I assume less chance of contact and wear especially in summer heat and with high revving engines or high load or high rpm or hot running turbo engines.
I always use one grade over the manufacturer recommendation (to neutralize cafe) or at least use a higher hths (a3/b4) of the recommended oil if possible. Meaning I never use xW-20 or lower. I prefer a solid 30 or a high hths 30 and/or a regular 40. However I pay good attention to the W rating as
@ZeeOSix mentioned. In general, I prefer narrow spread oils but have been violating my rule lately by using some Euro 0W-40 for the summer.