“It is difficult to give a specific answer to such a general question.

Antenna is always a trade-off between cost/size/performance etc.
See

WP008: Antenna Selection Guide For ISM Bands

If there is room the bigger antenna is better

A 5/8 dipole is a very good antenna. (total length is 1.25*wavelength)

A quarter wave on a good ground plane is often a good compromise.
But is require that product have a decent ground plane and that housing is not too lossy.

Moving the antenna to outside of enclosure is always positive for range.”

Last Update: January 24, 2020