Both are travel apps that functions as a map and offers different travel options (train, drive, cab, walk, and even ride-sharing) to suit your time and budget.
But for my family, we prefer purchasing travel sim cards because the kids are independent and adventurous, and there are times that we split up during the day.
When I asked before our trip, a pocket wifi rental goes for P590 a day for unlimited internet (4G + hotspot + powerbank) as opposed to this travel sim for only P350 for 7 days.
Another feature which we really appreciated was the free use of a mobile phone, with which we could make free local calls and use the WiFi for Google Maps to navigate around Singapore.