.... which one you would like to choose if u only have the choice between BTC and IOTA?
I never think about another coin while BTC is option. BTC has first ever decentralized cryptocurrency and after that, all the coins came in the market. And because of this thing, BTC has a massive effect on other coins and it will be manipulated to other coins. If the price of BTC has started gaining then the market will appear green and when BTC started losing its price that time all the market become red. So things kind of massive effect has BTC on other coins.
So always choose BTC over any coin. It has high potential in its growth. If you make your mind right now to making an investment in it then you will definitely make a huge amount of profit in the upcoming period of time.
I never had the confidence in intense bitcoin like you because sometimes the profits that other altcoin can bring, it is still very big and better than bitcoin but in this case, between IOTA and bitcoin, bitcoin will always be the most suitable option because IOTA has had a bad time, the value has been seriously reduced, the chance to return is possible but we will need to wait a long time. While bitcoin still maintains its strength, it can sometimes become very weak but it always returns to the right time, with such capital, taking advantage of frequent fluctuations from bitcoin, the profit we can get is very high and there is little waste of time waiting