I pretty much own all the derivative plays on Bitcoin/Altcoins. Most leverage is via the miners since the leverage seems to be about 2:1 although it still depends on if the general market is calm or in a panic.
Bitcoin --> MARA & RIOT
Ethereum --> Hive Blockchain (HVBTF on the OTC BB)
Seems like MARA is the best. If I remember correctly they were rolling out their coin generation at 16-20 Bitcoins/day from their Canadian server farms.
It seems like RIOT did better in the beginning but their mining operation seems to be inferior to MARA from what I read, at least in terms of Bitcoin generation.
There is also the Canadian Financial/Trading company Galaxy Digital Holdings (BRPHF OTCBB) that owns the second most Bitcoins after Microstrategy. I believe they own about 17,000 Bitcoins. The trading seems erratic at times, however. It was started by former GS alum Novogratz who is constantly on CNBC shilling for it.
I also own all the Grayscale ETNs but only GBTC & ETHE are liquid. BCHG & LTCN are pretty illiquid especially LTCN which never seems to trade more than 10K shares no matter the price movement.
I got the chart from the main Bitcoin thread.