Standing in a showroom trying to decide on seats, the first thing I'd tell you is to sit in it for longer than feels normal. Thirty seconds, not three. Your knees should clear the table or desk without you thinking about it, your feet should rest flat, and if you're buying for a kitchen or dining table, slide it in and out a few times because that motion matters more than how it looks parked in place.
If you're starting from nothing, go with a simple upholstered seat in a neutral fabric over anything trendy or overly specific, because one solid, comfortable seat style will carry you through a dining table, a desk, a spot by a window, and you can always add character pieces around it later. For color and finish, mid tones and warm neutrals wear the best over time: a soft oatmeal, a weathered wood tone, a muted clay. Pure white shows every mark, very dark fabrics show dust and pet hair more than you'd expect, and anything too matched to one trend ages fast once that trend passes. Wood and metal frames in natural or slightly worn finishes hide scuffs better than anything glossy or painted bright white, which chips the first time it meets a doorframe.
Where these work best depends on how hard you lean on them. A busy family kitchen wants something wipeable and sturdy, nothing too precious, nothing with deep tufting that traps crumbs. A home office or a quiet reading corner can take more texture, more personality, since it's not fielding daily spills. Smaller apartments do well with lighter frames that are easy to move and stack, while a bigger family house can handle heavier, more substantial seats that aren't going anywhere.
Over time, a seat with a removable or washable cover will outlast one without by years, especially once coffee, red wine, or a toddler with a juice box gets involved. Solid wood frames hold their joints better than particleboard ones, which start to wobble after a year or two of regular use and a move or two. Check joints periodically and tighten any screws that loosen with use, since that's usually what fails first, not the fabric or the finish. Rotate cushions if they're removable so wear spreads evenly rather than settling into one spot.
Wipe spills immediately with a damp cloth rather than letting them set, and keep fabric seats out of direct sun if you can, since that fades color faster than daily use ever will.