LTE Direct-IP vs. PPP

What is the diference in load and speed if I use PPP vs default Direct-IP mode? (I’m using USB 4G modem, and download speed is sometimes above 100 mbps)

As it says on https://wiki.mikrotik.com/wiki/Manual:Interface/LTE “Note that using PPP emulation mode you will not get the same max speeds as using the native lte interface”

Without PPP I can not get status info:
/interface lte info lte1
failure: Modem does not have serial interface!

(same error appears on WinBox when I try to get lte1 info)