BTC is a symbol of cryptocurrencies. People have trust in this coin, even if fees are high and transactions are slow, BTC will stay with us. Most forks acts against him, so it won't be immortal. BCH has support from big miner, so as for today it's biggest concurent on bitcoin's level (compared to bitcoin gold, bitcoin black, etc...). So if you are looking for long investment pick Bitcoin. BCH is alt for me.