The thing too work out is if 4k isn't something your bothered about, is it worth getting the Firestick lite which has the same cpu without 4k but has android 9, and is easier to add external storage to, and £10 cheaper. @jfish
Isn't the WiFi better on the 4K version than the standard ?. If you can budget for an ethernet adaptor £13.99, that's if your close to your router otherwise opt for the cube 4k that has one in the box
Having played around briefly with the Firestick Lite, I would advise going for the 4K Firestick, at least until they perhaps iron out the bugs on the Lite. @jfish