I would choose the bitcoin and Ethereum pair because they have highest earnings that I can have because bitcoin is the most valuable cryptocurrency and followed by Ethereum, it will be easy for me to convert any of my tokens to the either of the two
The same would be the case with the vast majority of the users. Personally, I got rid of most of the tokens that I received from various bounty campaigns in 2018. I either converted them to Ethereum, or just cashed out. However, the Ethereum exchange rates have also fallen quite a bit since 2018. Anyway, it is still better than many of the tokens, which have become completely worthless.