IOTA because it solves all current btc problems:
-No miners (who have too much power in btc)
-No fees (which are too high for btc)
-More users means faster transactions (Exponential scalability) (bitcoin could in best case scale linear if block size would be increased)
-German Foundation with access to >100 million dollar funds (btc devs need money from blockstream and don't act indepently any more)
-Foundation members including influential people in old and new economy. (btc: none)
-Partnerships with big names in industry (Bosch, Samsung, Microsoft, Accenture, Cisco etc) and academia (UCL, Berkeley etc) (see here:
https://www.reddit.com/r/Iota/comments/7f3dmx/list_of_known_iota_partnerships_corporate/) (btc: none)