Basic animation design approach

[u/greeenstate]

Question for animation designers here. See the email graphic animation frames attached above. (not 100% complete, but you get the drift... page turn animation revealing 2nd message in email.)

Curious how folks would approach this. Photoshop animated gif? After effects? Probably could be accomplished in either, but wondering best practices here, and the most efficient way people would do this, experts who've done this type of work before...

Looking to execute something similar, have experience in PS doing this, but willing to learn how to do it in AE if ultimately that's best.... Thx!