Hi there,
i have been there for 4 years and have enjoyed every part of it life is slow but peaceful.
will share my thoughts as to the details i know but do check as new rules come everyday.
You can transfer your vehicle from Uae to Oman once you obtain your Omani licence.
You need to apply for fresh licence once you are there and no conversion of licence is done now a days.
You can still have 3 licences with you of all Gcc but the country you drive that licence is counted as that is linked to your Oman Id card.
Regarding the rent its actually cheaper than Uae but depends which area in Oman your are placed.
rates vary as per area of residence and distance of commute from the city.
Cars are cheaper and lots of choice in uae as compared to Oman, if you are lucky you can sell your car too for a good price in Oman.
All the best for a much simpler and slower life in Oman as compared to Uae which is fast.
you will end up having more time on your hands and enjoy the mountainous stretch.
only remember one thing if you wanna drive down to uae after getting your visa be sure you get the right designation on the visa which allows you to drive in and out of the country without getting stuck and returned back from the border.