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Pi 1 a/b were really fragile but since pi 2 this problem is mostly solved. Still if I need to write a lot I would use a external drive. We have >300 pies running 24/7 on 52 sites all over the world. Even though we use no name brand microSDs we had only 2 failures because of a broken SD card in 4 years. Our partner company was using our hardware as a basis for something. After 1 month they asked us what SD cards brand we were using because they had a high failure rate. Our secret. We use a self made distro with minimal writes, they used default raspian and were writing permanently to the SD card.