yes, both, i finished up mekong in february, it was very lanky, pure sativa. breeders description is they have buddies in that grow it for them and provide them with the seeds. the germination rate is pretty bad overall(leading to the low cost of the seeds) i had about 35 seeds and had less than 10 successfully germinate, from that 7 were males, 3 were females, 1 female was less stretchy and had stickier stems, hollowed stems so i kept her because it had the traits i wanted in a female, i grew her out for a difficult 15 1/2- 16 weeks, this strain can go another 2 if need be but i pollinated 75% of the plant with one of my favorite indica's to make some hybrid seeds. the bud i didn't pollinate came out tasting kinda spicy, fruity and definitely had an "Up" effect, colors are vivid and no paranoia just very easy going sativa, if you cmoke a little bit its great daytime smoke, if you smoke alot you WILL get anxiety/paranoia jitters and red eye as i had these effects after smoking a blunt. Mekong haze can turn purple, like a blackish dark purple, it has a ridiculous stretch, it went into flower at 1 foot and ended up near 6 feet after super cropping, tying down and if you plan to grow this out, id recommend flowering immediately after it shows it sex, and keep fimming the plantto stunt its upward growth and get it to bush out a bit more. Mekong is not a very smelly strain indoors even grown in soil, had not issues with insects/bugs(never do) and if it weren't such a PITA to grow with the 15-18 week flower times i'd probably give it another go because the smoke was fantastic. i smoked the very last bit i had while hiking almost 2 weeks back, excellent weed if you are tripping shrooms(i like to smoke when tripping). The el dorado i got for free from Nirvana almost 2 yrs back. it was feminized, grew fast, looked like it had some indica in it(compared to the mekong for sure) and had serated leafs, grew tall but not too tall, like 3x maybe 4x stretch at most, it grew big heavy cola's that were rather dense despite being a pure sativa, can't remember the smell or taste, definitely NOT the main attraction of this strain, the high is stellar, very fast onset and long lasting. El Dorado has the kind of high that starts out like any ordinary sativa and just keeps climbing, smoke too much and i can't sit still. takes around 13-14 weeks to flower, tiull that date it was the longest flowering plant i ever grew but it was worth it(got into trying more sativa genetics).
long story short- El dorado is the better of the 2 if you simply want to grow it indoors or outdoors outside of a tripical climate, its high is slightly more racy, the mekong is "trippier" since it has a more subtle effect, and when it hits you the colors and music you experience seem to be more vibrant and pop. Mekong takes around 16 weeks to flower but can go longer or slightly less if you prefer a racier high. El Dorado takes 13-14 week to flower, has better yield shorter flower time and less finicky, much prettier bud overall.