Frequently called a "Three-Quarter" (3/4) or Small Double. It is wider than a single but narrower than a full double. It provides a more luxurious feel for a single sleeper without the bulk of a large bed. Your first photo (the blue set) appears to be this "in-between" size.
This is the standard choice for couples. It offers enough width for two people to sleep side-by-side. The cream set in your second photo shows this wider, more substantial frame.
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