hi,佯装 is more official and literature, 假装 is more spoken. just like hello and hey. i gotta go and i have to go, you got it?? oh , by the way , its awesome a foreigner know 佯装， becuz many chinese dont even know the meaning...GOOD!

假装是新出现的词汇，佯装这个词的历史比较久。生活中一般都说假装，即使在书面里，佯装也用的很少了~

"佯装” 大部分用于书面，“假装”书面和口语都很常用。

番茄和西红柿的区别 猫和咪咪的区别

佯装 多用于书面，就是写作的时候用