A reader looking into "bitcoin wallet app" is measuring coins against bitcoin, the one most people meet first. Players who pay a casino in crypto often weigh it against USDT or Ethereum, wonder whether bitcoin and cryptocurrency mean the same thing, and ask whether holding it is allowed in the first place. Each comparison below takes one of those questions, explains what sets the coins apart, and says nothing about where any price is heading.
For a casino player the comparison has practical effects. A balance kept in bitcoin rises and falls with its price between sessions, while a USDT balance aims to keep its everyday value but depends on its issuer. USDT runs on several networks, so the network chosen at the cashier must match the one used to send. Tokens on Ethereum need ETH in the same wallet to pay gas. The law that governs gambling with crypto is the player's local law, whatever licence the casino holds.
Bitcoin vs USDT is a comparison between two different jobs. Bitcoin has no issuer; new coins come from the network's own rules, and its price is set by buyers and sellers, so it can rise or fall sharply within a day. USDT is a stablecoin issued by a company that aims to keep each token equal to one unit of a traditional currency, backed by reserves it reports holding. Its steadiness rests on trust in that issuer, which can also freeze specific addresses. Neither is better in general; each suits a different purpose.
On the reserves its issuer reports holding and on trust in that issuer, which can also freeze specific addresses.
Centrally issued tokens such as USDT can be frozen at specific addresses by their issuer; bitcoin has no issuer that could do so.
Every transaction on Ethereum pays gas in ETH, so a wallet holding only tokens cannot move them without some ETH.
Tax rules differ by country, and many places treat selling or swapping coins as something to declare.
The network chosen at the cashier must match the network the coins are sent on, because USDT runs on several.
Bitcoin was built mainly to send and store value, while Ethereum runs programs on its chain and hosts thousands of tokens.