I was thinking to exchange my altcoins for some more Bitcoin, but I'm not sure which to sell. Speculating only, if you were to exchange some of your alts to Bitcoin because of the legalisation in Australia, what would you exchange from into Bitcoin and why?
It really depends on too many factors to decide something like that. Which coins do you have? Do you really believe they have a future and promising project, or your only holding them for a quick profit? Remember that the same way Bitcoin price can go up a lot, altcoins can do the same in the long term just like Ethereum and Dash did, for example.I'm thinking of exchanging from Ripple, but also I have my eye on IOTA, since I believe it will will not be the next big thing after Bitcoin.
Don't trade away your coins just because someone told you to do so. Do you own research and decide for yourself which ones are really going to be the next big thing. It is entirely up to you to decide what your cryptocurrency portfolio will look like. If you really believe IOTA market will grow, hold it. 