Android vs IOS choice

I am a java developer and I want to start developing mobile applications. The question is, which Android or IOS seems better? Can you tell me everyone's learning curve?

I also want to know the market or profit of each alternative

resolvent:

There is no better, just different

I think this is a personal opinion. I developed Android on two platforms and think Android is much better, but many colleagues vowed to IOS

I jumped from Java to Android to IOS. I'm not familiar with Objective-C. I have to say that the IOS learning curve of IOS is very steep at first. The syntax of Objective-C is completely different from most languages. It's not like Java, C, C or even Haskell. It says that once you understand it, it's OK

What kind of market is better? You must ask people with a good future vision. Android seems to be growing wildly. I bet, but you can't deny that Apple's IOS fan base is huge. Many people won't leave IOS for a long time

Apple seems to be the first person with long-term creativity. Even if they don't produce the best products, they are the first, which gives them a huge advantage over the competition

So, if it were me, I would develop for Android, but I can't tell you why. As I said before, it's really a matter of personal opinion. Decide yourself, look at some market statistics of the app store and Android Market, read their policies, and check some tutorials of the two platforms. Then you should be able to take a mildly educated guess to choose