It depends. There is no best antenna. You have to figure out what works best for you
and your circumstances. Don’t invest a lot of money in a portable antenna if you just starting in SOTA. Take a quarter wave of wire and a tuner, hang it in a tree (or any other support) and give it a try.
Question: What is your favorite portable antenna?
The rationale behind this was not to find what people thought was necessarily the best performing portable antenna but most likely to actually use.