Sorry, but if the amount is very small for realistic people will choose altcoin as their investment... and for idealists, will still choose BTC even though the profit is small... well, let's assume we are humans who really need money with small capital, so the best choice is on altcoin... this applies to one-time purchases...
If it turns out that later, it is confirmed that you will receive money again... then it is better to choose BTC as a form of gradual purchase, such as DCA...Maybe you have a small allocation now, but if it is routine and continuous to buy BTC, then you will get something that accumulates into a lot in the future.