The choice between buying cryptocurrencies in BRL (Brazilian Real) or USDT (Tether, a stablecoin pegged to the US dollar) depends on several factors, including:

*Advantages of buying in BRL:*

1. Liquidity: Larger supply of BRL on Brazilian exchanges.

2. Fees: Lower conversion rates.

3. Ease: Direct purchase with Real.

*Advantages of buying in USDT:*

1. Stability: USDT is pegged to the dollar, reducing fluctuations.

2. Diversification: Access to more cryptocurrencies on global exchanges.

3. Protection: Against fluctuations in the Real.

*Considerations:*

1. Conversion rates: Check the BRL to USDT rates.

2. Spread: Check the difference between the purchase and sale price.

3. Regulation: Check the rules for buying and selling cryptocurrencies in Brazil.

*Tips:*

1. If you plan to invest long term, USDT may be a good choice.

2. If you are looking for liquidity and ease, BRL may be better.

3. Check the conditions of the chosen exchange.

Popular exchanges in Brazil:

1. Mercado Bitcoin

2. Foxbit

3. Bitcoin Market

Global exchanges:

1. Binance

2. Coinbase

3. Kraken

Remember to always research and consider the risks before investing in cryptocurrencies.