.... which one you would like to choose if u only have the choice between BTC and IOTA?
If i really had that amount, then I would really be cautious enough to choose the coin where to invest.
I mean 10 USD is a small amount but still money is money.
So the real question is where i should invest? I would say that i will invest in BTC only.
The reason is clear and straight, as BTC is stable compare to rest of the coins. So if the price went down then it would not be a huge loss.
Hope you get your answer now.
And maybe OP is trying to talk about 10,000 USD but put in a dot instead of comma between 10 and the last three zeros which would make you a bit more curious as how to take care of this much capital and to get it apportioned among many coins and go for it. But a wise selection could really lead one to a good return from the investment and when the market is favorable too, it is worth putting in $10k.