What environment and what applications are involved? What budget do you have?
First write down exactly what you require the Sd Card to be capable of doing or do for you. Make a list. As quantifiable as possible. Cost, size, speed, warranty, etc......
Then set up a checklist using those requirements that you can use to compare the products in mind.
Ignore any "features" and "functions" that are not required.
See how the products compare.
If a tie then look at the other "features" and "functions" to see if they are truly meaningful to you and could be useful.
Most likely that your requirements will evolve as you learn. That is a good thing. Let the requirements checklist evolve with you.
Use the checklist again.