You should first define what is the folded size you need.

You will then know if you need a folding bike with the folded size of the Brompton.

The Brompton (and Dahon Curl) are smaller than all other folding bikes and folds very easily, this is their main advantage.

For the gear inch range, stock Brompton (even the latest 12s) have a limited range: about 300% for the 6s, about 400% for the 12s.

The recent 12s that exists only on the high end P-line and T-line will cost much more than 1000USD.

Its also possible to upgrade a Brompton with a Rohloff 14s IGH to have 526% but its also expensive (the Rohloff hub alone cost much more than 1000USD)..