My first ever grow, which was actually a lot more successful than subsequent grows, I used 2L hempies with a hempy mix (70% perlite and 30% vermiculite). Plants GOT HUGEEEEEE... I let them stretch too much by not keeping lights close enough, and I didn't know how to train them. Each one had a bout 20g and one had a little more than an ounce. They needed water every day. I think 2L is a good idea because when it's smaller it's harder to overwater because the tiny buckets just don't hold that much anyways.
If I had it to do over again though I would use 100% perlite and water 1-2 times a day. I didn't like how much moisture coco and vermiculite hold. If you are prone to overwatering (I M THE OVERWATERING CHAMP OF THE UNIVERSE) I would reccomend a higher amount of perlite in the mix if not just 100%.
Good luck on whatever you decide ;D