Both can get us good profits. But the bitcoin could rise more as it has more users.
Users don't make the price rising, it depends on demand and supply. It's pointless for having lot of users but they don't even take a part on trading.
ether has a large user base. many ICOs are built on ether. it is the basis of altcoins. In the long run, it is worth investing. Bitcoin is also a good choice.
Ya, this is why ETH still exist until now. Most of ICOs are using ETH as their contract and as the time goes, more and more people will know about Ethereum.