Settings for first run through? Veteran(ish).

I play pokemon games on my commute to work - looking to start Unbound after finishing black 2 on challenge mode. Was fun, but lost its lustre after beating elite 4 and was still very easy.

Should I start Expert of Difficult?

On Expert do you basically need to grind out perfect IV's for everyone with ditto breeding? that doesn't sound appealing to me. If Expert is just super hard with training and team/move selection. That sounds fun. But definitely do not want to go through RNG grinding for good ivs.

Should I use exp share and level cap on for both settings?