Bitcoin is suffering a massive drop in price today. It's almost losing the 27,000$ price range back to the 26,000$'s, but you still have 2 days to wait and see what the tendency is before placing your bet. So far the 27,000$-30,000$ bet seems the most reasonable alternative, even because a sharp fall in price (like the currently one) can boost a new rally which can increase the price on the next 7-10 days following the same intensity it has fallen so far.

On the other hand, it can take longer for BTC to recover after the currently dump. So I would say gamblers who went for 25,000$-27,000$ bet still have the chance of being the lucky winners next round and growing their wagers by x4.06. Let's see...