When choosing Shopee Mexico or Brazil, you need to consider the following factors.

First, consider the target market and potential customer groups.

If your product or service is more suitable for the Mexican market, then it is more appropriate to choose the Mexican site; if it is more suitable for the Brazilian market, then it is wiser to choose the Brazilian site.

Secondly, consider the user scale and activity of the site. If the Mexican site has more and more active users, then choosing the Mexican site may bring greater sales opportunities.

Finally, consider the competition situation and market maturity of the site. If the competition is fierce and the market is relatively mature, more marketing and competition strategies may be needed. In summary, based on factors such as product adaptability, market size and competition situation, choosing a suitable Shopee site can better develop the local market.