When buying truly wireless earbuds, make sure the design suits your ears. Some users may prefer the unibody plastic design while some may want the buds to have rubber eartips for more grip and comfort.
Sound quality is generally determined by the driver size, maximum volume (dB), and the sound signature. Check reviews to see if the sound profile fits your taste. If confused, better try them at an offline store.
Sound Codec is another factor that governs the sound quality. TWS with SBC codec may not sound as good as the ones with AAC or Qualcomm aptX. Then comes high-res LDAC which is the best of the lot but rare to find.
Check the charging case design- is it too bulky to be carried around? How does it charge- USB-C or age old microUSB? Also, does it support wireless charging?
Battery life is another dealbreaker when buying truly earbuds. Most manufacturers claim a battery life of three to five hours. Also, do check the number of times they can be charged inside the case.