My opinion: close your thread because your topic has been repeated many times in this forum or it's easily found in newspapers, webpages.

the main difference is that majority of the people supporting bitcoin (specially those who came before the ATH in 2017) understand bitcoin enough not to make mistakes like this.
you don't even know that ETH is a token and not a currency and you still say it has the same function! ETH and BTC are not even in the same category to be compared to each other!!!

and I suggest you do some search. this question you asked here has been asked at least 10000 times. in fact it is being asked almost every 2 days.

The difference between altcoin and bitcoin is that bitcoin is one of the most expensive, tradable,mineable coin,its one coin that every other coin want to gain exchange with, while other altcoins are not so,that gives bitcoin the edge..

what makes bitcoin different from other coin is its total supply coin.
limited total supply makes bitcoin value is the highest.
you can see the total supply only 21 mil, it is a small total supply if you compare with other coins like ethereum.

in my opinion, bitcoin like a lottery if we buy it cheaply, after 1-month bitcoin price rise then you get profit. because bitcoin prices are very difficult to predict, otherwise if the bitcoin price decreases from the price you buy, then you will lose as it drops from the price you buy. If your money is limited, playing bitcoin is a very speculative risk and this will bring you a loss in investment.

I think that makes the bitcoin with the other first cryptocurrency is about bitcoin usage compared to other coins.

     The reason or things that makes bitcoin different to another coin is the acceptance of the people or the demand. Bitcoin has a large volume of demand that make it famous and valuable digital currency compared to other coins. Bitcoin also is the first digital currency that trusted by most if the people.

What distinguishes bitcoin from other cryptocurrencies because bitcoin is the main platform for other cryptoes, and public confidence in bitcoin is also very influential.

What makes bitcoin different and special is because I see bitcoin as the mother of all coins, if bitcoin was not invented there will be no altcoins like ethereum etc. Bitcoin is the most popular and most use coin in the world of crypto, that's why many is taking the risk to invest in this coin.

First, Bitcoin fees are not expensive, they only get expensive when there's a huge amount of transactions, usually spiked by increase in trading volume. This problem is universal to all cryptocurrencies, coins like ETH has also suffered from high fees and delays in the recent past. If some coin has cheap transaction fees, it only means that it's barely being used, not that it has some superior tech.

So, why Bitcoin is different? Well, in my opinion it's different from all other coins because it has drastically different developers than other coins - Bitcoin is an open-source project were anyone can contribute and it has hundreds of contributors. Changes are discussed and tested by brilliant people who are experts in cryptography and programming, while with altcoins there are usually just a few people who do all the work, while the rest of the team is doing marketing, trying to convince everyone that this coin is better than Bitcoin, but from technical point of view this is not the case - Bitcoin is the most resilient and decentralized cryptocurrency, while altcoins are very raw, untested and just have huge design flaws that are brushed off by their marketing teams instead of being addressed.