SCCM vs Autopilot

first , thank you very much. 

second , it will be a full migration to a new company , new domain. 

your suggestion is totally useful. 

in my case what i'am struggling with is , all machines are existing ones , which i mean i will have to install w11 OS fresh installation , than Autopilot process. and i find it very long process to deploy all the machines , while in the past with SCCM using PXE , i could deploy lot of number of machines at once , joind to domain during the TS , easier and faster . 

i am wondering if there is another way to get ISO image with Autopilot in it ( sorry i'm new in Intunes, Azure and cloud solution ) to make imaging machine little bit faster than this wayy