I think it really depends on the vibe you're going for at the wedding. When my brother got married, he wanted all the groomsmen, including the best man, to wear matching suits. It made for some great photos and a cohesive look overall. If you're aiming for a classic and sharp style, like the ones you can find at Gentleman's Guru - https://www.gentlemansguru.com/product-category/wedding-tuxedos/, matching suits can definitely pull that off. It also made my brother feel extra special having everyone in sync with his attire. Ultimately, it's about what makes you feel comfortable and confident on such a big day.