I agree on this, Ripple is very much centralized to the extent where investors should be afraid of their investment, the developers created Ripple and gave it a general token supply of 100 billion tokens, i don't know how people still want to invest into a project that the developers can easily manipulate, things we don't see in Bitcoin with our 21 million supply and decentralized nature is enough outreach for investors to take accumulating process seriously without fear of losing money.
According to CMC, there are 58 billion XRP coins in circulation compared to 19.86 million Bitcoin in circulation. I am not sure whether more XRP coins will join the already coins in circulation or not but one thing is clear that there is already a huge supply of XRP coins in circulation. XRP may be a good Alt like Eth or Tether as it's been among top 5 Alts on CMC for many years now but it's certainly not comparable with Bitcoin because of various reasons like decentralisation, coins in circulation and security.
Both are from different worlds, and why would one would want to be better than the other? They have different goals and they achieve them differently..