I think personally, There are lots of nice bitcoin wallets out there, that could be the reason why you ask for the best. I think it will depend on how you use your wallet. If you are a trader, and live in Indonesia, the most popular and preferred is indodax. Indodax has the ability to act as a wallet and act as an app for sale and trade. I think most bitcoin holders want to know about trading. So this is one of my best choices for you. But if you live outside Indonesia and there is no plan to trade, the one thing I do not like is the much higher transaction costs among others. So if, you often send and receive bitcoins, cashing in and out, I can suggest using just to use the best local application in your area,