There are only two top arranger keyboards with 61 keys and no speakers:
Yamaha Tyros
Generalmusic Genesys Pro

The choice is personal taste as to which one you like the sound of but the Genesys does have some features not found in the Tyros:

Out of the box the machine comes with a hard drive, CD drive for playback and recording.
32 track vs 16 track sequencer
sampling (not available on Tyros)
Hard disk recording of audio inputs (not available on Tyros)
semi weighted keyboard feel

Tyros has 128 polyphony vs 64 for Genesys
Tyros has color screen

Almost all other features including vocal harmonizer, sound editing, performance memory, music assistant are the same type.

It becomes which styles, sounds and operating system you like better.

I sell both and people love both keyboards.

George Kaye
Kaye's Music Scene
Reseda, California