Which DSM version shall I use?  This is an oft-repeated question, complicated by the fact that different loaders support different DSM versions AND hardware platforms. In simple terms, DS3615/DS3617 has the widest support for hardware and packages, and DS916/DS918 has support for newer, low-cost CPU's, transcoding and NVMe cache (DS918 only).   But the real questions are, what hardware do you have?  What hardware do you want to buy in order to support what you want to do?  And how