I'm pretty new to this, and after researching a bit, I feel like ETH is going places and has far fewer barriers to expansion that BTC. I want to buy and hold some coins, and as of now i'm leaning towards ETH. but I can't ignore the fact that bitcoin seems like top dog still... so convince me to buy BTC instead of eth. Give a reason besides "first movers advantage" 
Bitcoin has a very good level of trust so we can get a sense of security and comfort in investing Bitcoin. In contrast to other coins including ETherum, Bitcoin gained excellent support by the government and there have been several countries that expressed support for Bitcoin. This can be a plus because Bitcoin is getting easier to use in every financial transaction.