There is no single best sex toy for men, because different types do different things. Some questions to start from:
Should it be used alone or with a partner? For masturbation, a masturbator is the most direct choice. During sex with a partner, a vibrating penis ring is the toy that gives something to both of you.
Do you want electronics? A manual toy is cheaper to run and has nothing that can break. A toy with a motor does more, but requires charging and an enclosure rating that can withstand the cleaning you plan to do.
Are you curious about the prostate? Then you need a toy made for anal use, with a base that prevents it from sliding in, and plenty of lubricant.
How much care are you willing to do? Silicone is non-porous and easy to keep clean. Skin-like materials in masturbators require that the sleeve is rinsed and dries completely after each use.