The views expressed here are completely fictional
Cali Con - personally I'd stick with regs wherever possible, there are just far too many horror stories of entire harvests being plagued and ruined by rogue nut sacks. A quick search and this is well documented by both rookie and experienced growers alike, and with genetic backgrounds its not hugely unexpected. For me the risk is too great, for others they may not be that bothered. By no means saying stay away from Cali Con, as swerves Tahoe OG (
regular) produced some pure fire for me, but be aware of potential nanners.
Dj short - has some excellent genetics, his sativa dominant blueberry is some phenomenal smoke, however these days is certainly not easy to find. Be aware there's two versions, Here's some more info -
https://www.rollitup.org/seed-strain-reviews/270956-dj-shorts-original-blueberry-vs.html#post5649444
DNA - never really had any issues with them, but haven't grown either of the two you mention. Have smoked chocolope though and it was fantastic, beautiful crystally buds, nice aroma and a chocolate orange flavour with soaring high. Fast flowering sativa Dom 9-10 weeks from what I hear. The exo kush, don't know much about.
GDP - haven't grown or smoked but have heard good things
Mr Nice - always good, you'd have to search quite a bit for a bad review and even when you find one a quick background check on the poster usually indicates that the issue was not the genetics
any of those 3 will be superb, however if I had to pick 1 it would have to be the black widow (which is actually the original white widow). If you're looking for a haze from him, I'd suggest the mango haze.
Mosca - again not grown but heard good things and cindy is always a winner
Reserva Privada - purple wreck great indica strain, the sky walker has a few different phenos from what I've seen.
Serious - bubblegum is great, ak is better.
Sweet seeds - decent rep don't know much about green poison though.
So if I had to pick 3 I'd play it safe, if you haven't tried these before they are well worth the time
1. Mr Nice - Black Widow
2. Serious - AK47
3. Mosca - Cindy 99 (grown out a few other c99 and always excellent)