It really depends on what repertoire one wants to play. Normally I would recommend the Eb tuning, to have also some flats. Myself at the moment I play a lot of Irish music and prefer the E´s and A´s goodsounding, so I tuned my harp in F leaving one flat possible. Also because playing in sessions uses the strings more than solo playing; my strings always break where levers are used.
Are there lever harps where the use of a lever does not affect the quality of the sound???
>Are there lever harps where the use of a lever does not affect the quality of the sound?
Yes, but it’s a question of the levers as much as the harps, though. Levers like the camac levers or some of the other metal levers don’t affect the tone of the string any more than the disc affects the tone of a pedal harp string.