All the various prices should be there on the internet for you to compare (the Swiss are very good at providing all prices on the internet and in English). The only variable is the weather, and the weather in the alps can be very fickle, you could spend a whole holiday and never see a mountain. If there’s a big difference in price then go for it, but if there isn’t much between an all inclusive pass and your best case senario on pay as you go at the lifts/mountain railways, then go for the pay as you go. You also need to read the small print with some of the offers, some of them might not include certain key lifts and/or the Gonergrat railway.