> Currently, MESS is probably very good to use for old, obscure game > consoles.
wrong. e.g. among the console you mentioned, MESS is definitely as good as the emu you mentioned for e.g. Vectrex and A2600 (I think the only thing Stella has in addition to MESS is the support for some specific homebrew expanded cart, but for classic games MESS should be at the same level of accuracy), and also for Intellivision and Atari Lynx.
it is also very good for classic home computers like c64, coco, IBM PC and classic Macs