Ethereum is a good coin, but what do you think in comparing ethereum with bitcoin? It's definitely a bitcoin that will win. Even ethereum can not be equated and compared with bitcoin. Bitcoin is already at different levels.
The bitcoin has more deep pocket investors at the moment. But it might split, so it might lose in the long term.
There is a possibility it might lose in the long run but as of now bitcoin is still in its rightful position and the split is just another way of bitcoin to be dominant compared to other cryptocoin. It also is highly impossible for bitcoin to lose its power because it has been there for how many years and a lot of big investors have invested in bitcoin too so I doubt they would allow bitcoin to just lose it. Bitcoin and Ethereum are also incomparable because they have different projects.