True, technologically, Veil offers the best anonymity and privacy currently available in the market of privacy coins. Coins like Grin, Mimblewimble,Onion and ZCash also offer good privacy and anonymity, however, the likelihood for the mass adoption for privacy still leans towards Veil because of its technological superiority; offering privacy and anonymity bith at the blockchain level and at the network layer.

True technical superiority alone is not enough ground for considering it for investment, however, looking at it form the adoption and implementation stand-point with the focus of Veil on research and development in order to ensure privacy and anonymity, I think it's worth having a closer look at.

That's a good read but I think Veil provides better privacy and anonymity. All the feautures you mentioned Zero knowledge proofs (Zerocoin protocol) and RingCT are all part of VEIL technology. However, VEIL has additional features for extra anonymity, privacy and security.

It depends on you as a person, what are you looking to invest in; technology or hype? The cryptocurrency community is experiencing a wave of potential 'regulation' in the form of identity verification. Some countries do not support the use of cryprocurrencies, in a case like that, the best alternative would be a privacy coin with user anonymity; there's only one coin right now with such; Veil. However, if you're looking to just buy and hodl, personally coins like VEIL, NEO, and TRON will likely see massive adoption in the nearest future which will definitely drive prices.