Its going to be interesting to see what can be done on EOS mainnet. Launch will be early June, IMHO will have a slower start but by the end of the year we should see where is it going will it have some interesting projects under its wing. I wonder will the many platforms find their users.. There are many more platforms outside top20, and their value depends on if they have a specific application, an exceptional pitch or extremely good marketing. Personally would go for ideas with a  with a specifc but broad apllication. Also, one that is just around the top 20 is Lisk.