My opionopinion:
The 1st one is a comment to me. The word "try" is key here: that makes it a comment since the poster is basically guessing. The claim to use ibus-libpinyin should have come with text to why it should be used to make it a good answer.
The 2nd one is just plain wrong. Not even low quality. Out of the possible options given I might have voted for 'comment' too though.
