Tried all of them, Genius sound and genius+ optimum sound are harder than the nimbus soft/sound and Energy xtra rubber.
Compared to tenergy, the genius rubbers are a little softer.
The express 1/2 rubbers were rubbish for me. They got some weird catapult effect, when you try to loop a heavy backspin ball, they make a high throw and I always played them over the table.
Nimbus soft is a little slower for me than the nimbus sound.
Lots of people in belgium play with genius sound on the forehand, its a very decent rubber and I think a good replacement for the tenergy rubbers.
So if you like harder rubbers and you dont want to pay too much, I would say go for the genius sound.
If you like just a little softer I would go for the genius+optimum sound.
And if you want to go for a lot softer, take nimbus sound/soft or the energy xtra.
But if you like the feeling of tenergy then nimbus will be way too soft for you. Because for me it feels like a glued samba rubber, which used to be the softest rubber I know when speed glueing was still allowed.