Part 1 of the Erdrick Trilogy
Best version may be on Android/iOS

Part 2 of the Erdrick Trilogy
Best version may be on Android/iOS

Part 3 of the Erdrick Trilogy
Remade for the GBC
Best version may be on Android/iOS

1993 : DQ1 + DQ2 were included together on the Super Famicom in JP only
2000: The compilation was re-released for the GBC in NA

Part 1 of the Zenithian Trilogy
1992 NA, NES
2001 JP ONLY, PSX
2008 NA, NDS
Best version may be on Android/iOS

Part 2 of the Zenithian Trilogy
1992 JP Only, SNES
2004 JP Only, PS2
2009 NA, NDS
Android/iOS version is identical to NDS

Part 3 of the Zenithian Trilogy
1995 JP Only, SNES
2011 NA, NDS
Android/iOS version is identical to NDS

2001 PSX
2016 3DS - fully 3d remake

2005 PS2
2016 3DS (considered definitive)
Android/iOS version is meh

2010 NDS

JP ONLY MMO

2019 Switch/3DS
2020 PS4/PC/XBOXOne
An enhanced version of DQ11
includes 2d game

2017 JP PS4/3DS (3DS version includes 2d game)
2018 NA PC/PS4