The safest and easiest way to currently hold your Monero is using the new official GUI wallet from getmonero.org. This way you control your own private keys, although it does need to sync the entire blockchain but this is a good tradeoff until Jaxx comes out with their wallet. I would also hold on a few releases to ensure it is implemented properly before trusting the Jaxx wallet with a new currency which is complex to implement as a light wallet.