What are the best cycling gels?

This question is about
Elle Penner, MPH, RD
The best cycling gels, according to cyclists, include Science in Sport Energy Gels, Maurten Energy Gels, High5 Energy Gels, and GU Energy Gels
These gels rank high among cyclists for taste, digestibility, and ease of use on the bike, though flavor and consistency preferences vary greatly between athletes. 
If you like the convenience of a gel but not the sticky consistency, GU and High5 both offer liquid “gels” that deliver the same fuel in fluid form, similar to a sports drink.
cyclist eating energy gel with hills in the background