Well to be completely honest with you, it's a little trial and error and asking your friends. One kind of gel markers I recently tried out are AmazaPens Gel Coloring Pen Set. There are a total of 24 pens, 12 glitter, 6 neon, and 6 pastel.
The pens come in a nice plastic case with a snap closure making it easy to store them. I don't use markers very often, so this is really nice for me. I can keep them in the case storing them horizontally to keep them from drying out since I don't use them too often. By the way, storing markers horizontally is the best way to keep them all the time no matter how often you use them.
Surprisingly, the one pen I like the most is the white ink. It works well with my colored pencils for highlights and emphasis. I've used it a lot and like it very much!
This is a nice basic set of gel pens, and would be good for most coloring projects to help you relax. They sell for a good price too!
You can buy the AmazaPens Gel Coloring Pen Set HERE!
This reviewer received the product free or at a discounted price in order to bring you an honest review. No other form of compensation was given. All opinions are those of the reviewer.