This is a simple question really. A vendor I'm currently interested in only offers a first class mail shipping option. I know this will take longer than priority, but that doesn't bother me much. But is there more risk with first class mail? I'm only ordering some RX meds.
The less time in transit, the less time there is for it to be caught/intercepted. That being said, I've used both priority and first class on around 30 orders and all have made it to me just fine. Sometimes first class with some vendors can be quicker than priority with others. For example, I ordered from HoS and it took 8 days to get to me from the day I ordered, shipping priority. On the contrary, I ordered from BV with first class and I ordered on like a Thursday and despite the weekend, it arrived the following Monday. I prefer priority cause it's generally quicker but it also costs more usually. And priority had tracking which is important in the event of needing delivery confirmation and such in the event of a dispute.