You can use two sim cards at the same time with the best dual-SIM phones. The popularity of dual-SIM phones has always been popular in Asian countries. You don't have to carry two phones with you when traveling with a dual-SIM phone, as you can still use your primary sim and pick up a local one.
The best phones in the world come with a dual-SIM card slot, but they aren't available in the U.S. because of the carrier-driven environment. With the rise of eSIM, you can get dual-sim on almost any phone.
At the moment, the best choice is the S22 Ultra. The S22 Ultra is my favorite phone of the year so far. The combination of hardware and software makes it the best option.
The S21 FE is a more value focused phone. The best features of the S21 series can be found in a more affordable package. Long-term software updates are the icing on the cake.
The value category is a good place to look for alternatives to what Samsung is selling. The X4 Pro is a budget phone from POCO. The phone has a huge battery, powerful internals, and is a great value.