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PlayStation 3 & PlayStation 4: Honestly, these two consoles do good when it comes to Sony's exclusive games. Over 100+ exclusives on both the PS3 and PS4.
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Wii U: I'd prefer the Wii U over the original Wii simply because it's a, "two-in-one system." The Wii U allows you to access the old Wii Menu and Wii Shop Channel; which gives you the ability to play Wii games you've previously owned. Another factor is that both the Wii and Wii U are easily hackable; given you full access to your system and many cool features such as: emulators (you can literally emulate
all of Nintendo's consoles), USB loaders, custom themes, etc. Also, good exclusives.
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Nintendo 3DS: Possibly my favorite handheld, honestly. Allows you to play previously owned DS/DSiWare games onto the handheld. The 3DS' library is getting better and better; containing good exclusives and more easily engaging play sessions. Another thing to note is that flashcarts made this system better by allowing you to play emulators, DS homebrew/applications.
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PC: Simple reasons: emulators, 60 FPS, HD/HQ upscaling filters, save states, etc. You can basically emulate any gaming console/handheld starting from the very first to the seventh generation.
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Mobile Devices/Smartphones: Has the ability to play retro games from emulators. iOS devices kind of lack in this department, (since Apple revokes the use of them); but Android exceeds without limits.