I think one of the reasons why Bitcoin trading is the best and the best is that when one trades only Bitcoin, his profit will be less than other coins or tokens and vice versa the chances of losing from other coins or tokens will be much less. I personally think that Bitcoin can be the only product for long-term trade management or long-term planning.
Do you think there could be anything other than Bitcoin in terms of long-term planning?
In Crypto currency world I don't think that there is any others better options like bitcoin . Because Bitcoin is perfect for both security plus profit. Bitcoin is one of the best digital assets. So there will be no question of how Bitcoin will be for the long-term, practically if we look at the previous history it will definitely be good. But since you have mentioned trading pairs here, I would say that selection of trading pairs really depends on personal strategy. It can be different for everyone on those uses