nRF9160 modem FOTA - what library to use

Hi, 

We are considering a modem delta FOTA on our 9160 devices in field, but find two "approaches" described to this;
Either using the modem AT command set (AT#XFOTA=2,*  etc) as described here: https://docs.nordicsemi.com/bundle/ncs-2.5.0/page/nrf/applications/serial_lte_modem/doc/FOTA_AT_commands.html
Or, by using the nrfxlib stuff and delta DFU API as described here: https://docs.nordicsemi.com/bundle/ncs-2.2.0/page/nrfxlib/nrf_modem/doc/api.html#delta_dfu_api

We also find the sample application "HTTP modem delta update" seems to be using the latter.

What is to be recommended, and why (what seems to be) two "similar" ways of achieving this?

We currently use SDK 2.5.0.

TIA

Alf

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