I didn't find much difference to be honest, slightly different cutting angle but still depends what razor you go for. Most recommend 1912 Ever Ready or Gem as a good starting point (streamline if you want go spend a bit more) - one thing I do really like is the noise.
Blades are a bit more limited but those from Connaught are ok, bit pricier but I find they last a little longer than DEs
I don't really favour DE over SE, but it does add something different to the rotation
Then you have injectors of course