Choose GP! Once you understand the characteristics of GP and how shortwave signals propagate, you can try using a feedline. When first getting started with shortwave, it's best not to consider using a feedline. It's inefficient, and FT8 requires a ground connection; otherwise, common-mode currents will cause interference. Also, if the antenna height is too low, directional prediction becomes difficult. Generally, the antenna height should be greater than λ/4 (this is the value). Of course, you can still use a feedline, but it's just a matter of whether it's enjoyable or not. The advantage of GP is that it's easy to set up; find an open area where propagation is good, and FT8 and 10W can easily reach South America.
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