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I like my balance displayed in fiat, USD in particular.
Although it is like that, my deposits are mostly in bitcoin, few times in ripple. These deposits are most of the time not just displayed but also converted into fiat. I do not like it if my wallet's value is constantly changing because of the volatility of Bitcoin or XRP.
I don't track my gambling expenses but I think that is a great idea.
Most common crypto used by majority is bitcoin since many want to see great volume earn while speculating some good price increase on its volatility. Sometimes also I use USDT since this is somehow called safe haven by some people when the market us in bad shape and don't want to gamble my bitcoins which I bought at more expensive price. Also looking for xrp as alternative but for now my balance always converted between BTC and USDT only.