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Some printed antenna designs are using high permittivity (er) substrate, other designs are based on low er. That'a a design parameter and not generally better or worse. You're apparently referring to low loss substrates, but intended frequency range and optimal permittivity for your design must be known. Whatever your detail specifications are, you most likely find something useful e.g. at https://www.rogerscorp.com/acm/producttypes/2/High-Frequency-Laminates.aspx.
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