Both of these boards complement each other very nicely!
I have the 1st board- it has some great sounds (particularly the hits, orchestra sections and ensemble strings. The pianos are pathetic however. It has a superb classical guitar patch also.
I will also the the 2nd board. I've played it and to me I think that the sampling is better on this card. The strings and brass sounds are definetly fuller sounding but this card doesn't cover all the bases of the 1st card. Whether you like the celtic sounds is a matter of taste. The choirs on the 2nd boards are absolutely superb (I want this card for those sounds alone believe it or not!!). Think ENYA when you heard those sounds.
In the end, give both cards a try. You can't go wrong with either of these are they both complement each other rather than outdo each other. Cheers.