the first zebra seems to be the more sought after (L46), although in rarity, its much less common for you to possess the L98 or L173. i think these may cost even more that the L46 nowadays. the reason the L46 is sought so much was oringinally because it is one of the few plecos that are 100% black and white (in pleco terms) and are striped close to perfectly. the L098 has more broken stripes (see wyldfyas pic), and the L173 has less unbroken lines, but less straight than the L46, see below

