Low pitch roof materials/costs on rentals.

[Bienes Raices]

We have a lot of older houses in this area with low pitch roofs.

Does anyone have any experience on the costs/lifespan of roll composition and tar and gravel for a rental?

My understanding is that roll composition is cheaper than asphalt shingle but also lasts for a lesser amount of time. I called a local roofer and they said roll was an inferior product and they don't use it.

Is it better to stick to houses with a higher pitch and asphalt shingles, or does it make a difference?