It's difficult to answer this question.bitcoin and ethereum are unique in their functionality.

Bitcoin is not governed by anyone and only open community is responsible to scale thier functionality,due to segwit hard fork Bitcoin also divided in 2 group .core and BTC.Similar thing happened with Ethereum and ethereum classic.

This forks certainly creates an issue amongst the community and investers .

However ETHEREUM has strong leadership of vitalik buterin and thier vision is clear where Ethereum should go whereas Bitcoin is just currency which store and transfer only values no contracts associated.

Definitely Ethereum has lot of scope for growth due to strong leadership whereas Bitcoin may grow potentially but it's future is uncertain as long as someone owns it.