What do people think? Is it better to invest, say, 100 dollars in ether or bitcoin?
Both of the coin that you chooses are good to invest with especially these are the top 2 rank cryptos in the market and if you want to hodl it for a long term basis they are the right coin for you. However if you are just here for a short term investment better to do your research in NFT tokens because that is the trend as of this year and I don't think that ETHER and Bitcoin is beneficial for you in just a short term run.
Long term investments in ethereum and bitcoin are more profitable than short term investments. Both currencies are good in the crypto market but there is a long wait but if you invest 100 then it is better to invest in ethereum is best for investing with much less capital than the value of Bitcoin the price of this currency will go up further.