When selecting a portable device for emulating arcade games, including those with joysticks and non-4:3 aspect ratios like ZX Spectrum, several options should be considered. Let's examine the devices you mentioned and their unique features:
Retroid Pocket 3: Compact design, built-in joystick, and buttons. Supports various retro gaming systems, but has a 4:3 aspect ratio screen.
Odin (Lite or Pro): Powerful handheld gaming devices with larger screens and customizable controls. Can emulate arcade games, but also have a 4:3 aspect ratio display. The Odin Pro offers HDMI output for playing on a bigger screen.
ANBERNIC RG351/RG353/RG505/RG552: ANBERNIC offers multiple handheld devices with different screen sizes and aspect ratios. They can emulate arcade games, but it's important to check the specifications of each model for screen size and aspect ratio compatibility.
ANBERNIC RG353V: This variant has a vertical layout suitable for games with a portrait orientation. Consider its game compatibility and features compared to other options.
Powkiddy RGB20S: Compact device with a 3.5-inch IPS display, but also has a 4:3 aspect ratio screen.
For non-4:3 aspect ratio support, you may want to explore options like the Retroid Pocket 2, which features a 480p IPS display and supports various aspect ratios.
Ultimately, the best choice depends on your preferences, including screen size, aspect ratio support, build quality, and overall performance. Research each device, read user reviews, and compare their features to find the one that best suits your gaming needs.