The good thing is you don't have to decide to use either Cash or Bitcoin. You can use both. Each has its advantages and disadvantages. E.g. cash is accepted almost everywhere in your country. Bitcoin is good for sending over the internet.
I kinda like Byteball because of it's technology which is similar to IOTA but has a much lower market cap. Unfortunately price has gone down quite a bit in the last months so I'm not sure if I would invest.