Went through my cards and decided on my Insert set of the year 2018:
Topps Finest Cornerstones.
I like the design a ton - the gemstone design combines with the pictures nicely. And the Angels logo on the helmet reminds me that it is not Panini.
Next up:
Base card of 2018 (Thursday)
SSP Card of 2018 (Saturday)
Feel free to post some of your votes. I know we spend a lot of time looking at the Mike Trout cards of 2009-2011 - just thinking about what became available in 2018.