I would buy ADA. Cardano cryptocurrency is not just another coin, but a real technological platform, with the help of which the team of this project promised to solve all the shortcomings of the digital money market and blockchain technologies. So she has great prospects and I think it's a great option for you!
Cardano is definitely a great project but why limit yourself to buying just one of two coins? Neo is insanely low right now and its very safe to assume itll go back to the ATH next run