Lowrey: Easy to play but not the most advanced technology wise. (They always sound great though)

Bohm: is the competitor to Wersi, as they also constantly update (At a cost) their instruments, (Some requiring hardware updates) but definitely worth having a good look at. (There are plenty of You Tube videos featuring the Sempra models)

Allen: is for the dedicated Classical & Theatre organ enthusiasts, so no home entertainment features are included.

Ringway: are a very popular instrument as they are reasonably priced (For an organ) and are easy to play, however you are stuck with what you get, so you need to change the instrument for an upgrade. (There are 2 types, one voiced for the western market and one for the Asia market)

Thomas: the original firm ceased production decades ago, however the name was bought by I believe a Dutch company, but I haven't heard anything of them for years.

Estey: budget instruments which never seemed to take off.

Yamaha: still big in the Asia market, and many have imported them to western countries, (NOTE: the elctone (Organ) team are not the same as the arranger or synth teams) if you like Yamaha (And plenty do) then they are a great instrument but feature wise fall short of Bohm or Wersi.

Roland: great instruments, but they pulled out the market a long time ago, so the technology is older than current instruments still in production by other manufactures. They are great value on the used market, and their onboard amp and speaker systems are fantastic. (Defiantly worth a look at if you like the sound)

Hammond: well! there is Hammond, so no more needs to be said.

The rest went by the wayside long ago.

Popularity sales wise:
Asia
Europe
US
It is a niche market, but there are still enough buyers to keep the existing manufactures going.

As always, there is no one size fits all, so the choice will be up to the individual.

BTW: the VB3 organ used in the Wersi, is actually a Hammond emulator VST made by GSI, (Hence the VB3 name) which Wersi have licensed from them and designed their own interface. (All the other organ emulations have been created by Wersi)

Bill