It's clear that Bitcoin is the best among other cryptos. But when the capital to buy Bitcoin can only be in decimal amounts, then therein lies the choice. Whether Bitcoin in decimal amounts or Altcoin in amounts of 1.
In this case, the best scenario suggestion in my opinion is almost the same as Pandu Geddon's view. Just collect the amount of Bitcoin little by little with the foundation of its value because any amount of Bitcoin will not change its value in the future.
Personally I invest small amount of bitcoin in the beginning, because I don't have big capital to take a certain period, 2019 is the beginning of my journey in bitcoin, then I start small and buy gradually. Currently, the strength of the investment that I have made has reached more than two years in bitcoin, where I see several market conditions that occur, corrections and recoveries always amaze and surprise me. But what I understand bitcoin is able to maintain value and is a promising investment in the long term.
While in Altcoin I have not been directly involved in investing, I only took advantage of sigt campaigns in the past, but for now I am rarely involved, so there are not many references that I can discuss, although it makes perfect sense what Pandu Geddon said.