Never grown either species but I suspect both will like and possibly require intermediate-cool temps, moderately high humidity, and abundant fairly pure water (like rain, distilled, or RO). If you can't provide all or any of these conditions then it may be kind of a crapshoot as to whether you can grow them well, though many orchid species are surprisingly tolerant of variance from the norms of natural habitat.
NOT trying to dissuade you from trying these species, rather trying to prepare you for the possible failure that is part of growing any orchid outside of natural habitat, failure (plant decline/death) becoming more likely the further your conditions vary from native ones.
If you're interested in doing really well by these plants, I'd suggest buying and studying the Bakers' culture sheets
on them. Ray also has some great info on his site about 'stretching' temperature conditions
, though things like high-TDS water may be harder to work around. Of course, if you already have a cool greenhouse with a pure water source then you may be all set.
Good luck, you have great taste in orchids!
BTW the Symphyglossum seems more widely known as Cochlioda sanguinea, while the 'official' name according to WCSP
was recently changed to Oncidium strictum, so if you have trouble finding info online try some of the alternate names.