I have a few apps on the AppStore, Quotegram, Islamgram, PrayerTi.me, and I would love to build more as there is no end to great ideas for Apps. Given the broad International reach of the AppStore without any overheads of cross-currency issues and such it feels best to be on the AppStore. At the same time, there is not much money that I can make with these smaller apps unless some of those make it huge. I don't want to slap ads on these apps as that would ruin the user experience. On the other hand I've been toying around with a SaaS business idea that would possibly bring in monthly revenues but the market segment is not great at doing online activities but certainly there is a need. I'm confused on which of this segment to choose to spend my time and energy on. Any suggestions?
I would say don't let the revenue be your deciding factor. Build the idea that you enjoy the most. If you'd really like to try both then go for it.
Just be careful to validate your SaaS business idea early and often, as it can easily become a much more complex project than what it sounds like you've put together on the AppStore. Also, something critical to keep in mind here is how you will obtain customers. You mention that the market for this app isn't very used to working with online tools, how will they find you? A benefit of the AppStore is that it can provide a lot of the traffic on its own. With a SaaS app you need to generate traffic yourself.