Newbie question about AEM


I would like to ask what exactly is the difference between AEM and TrenchBoot? What is recommended to install on Lenovo ThinkPad T490? Is Trenchboot better than coreboot supported on Lenovo x240? Sorry for the stupid questions, of course I read TrenchBoot Anti Evil Maid for Qubes OS - #10 by Insurgo before but it’s still not clear to me.

Thank you