Been playing the PC version excessively for the past month (most enjoyable game I've played in years) and decided to give the iPad version a crack. Enjoy that the iPad version is a bit trimmed down as it allows for a quicker game (usually play the iPad version when transitting)
There are actually a couple of features from the ups version that surpass the PC version.
Artillery being overrun - big frustration in the pc version is you try to overrun an exposed artillery battery. Seen 2000 strong brigades barely put a dint when charging some batteries. I Like the iPad version where if you charge an exposed battery it literally melts away.
Also charging a unit that routs in the iPad version seems to provide a better outcome (albeit it probably needs to hit a balance about half way between the pc and iPad version)
Otherwise great game