I've grown (outdoors) both Buddha Tahoe OG (as opposed to Tahoe OG without the Buddha prefix) from Cali Connection and Reserva Privada OG#18 for two years running. Both from femmed seeds. I love them both.
Here's my take:
The OG#18 smells rank of diesel fuel but the buds are not as dense as the BTOG. You can smell Chemdawg in it's lineage that's for sure. My friends keep asking for it, so I'm ordering another batch for 2014. $98 per 6 fems. It's a kick ass strain, the smell itself sells it. A moderate producer.
The BTOG produces hard golf ball nuggs not as smelly, but I think it is more potent. A real good producer too. Terribly expansive on the lungs...you will hack. Shitty germ rates, but if you get one going you're in for a real nice surprise. I've got 18 seeds ready to pop this spring again. at 115 per 6 femmed seeds it aint easy on the wallet. Now I know most hate swerve, but I don't care this strain has been the best in my garden for two years running and I'm sticking with success.