If the modern armchairs and the sofas belong to the same collection, the problem of matching doesn't arise. The alternative is to choose living room armchairs and sofas belonging to different collections, but within the same same style, creating a more dynamic and personalized look.
If desired, you can play with different colour tones as long as they complement each other well. For example a burgundy armchair can be paired nicely with a dove gray sofa, but not with a sofa with light blue upholstery.
Alternatively, the common thread between sofa and armchairs can be the color, allowing for more freedom in terms of style. However it's better to avoid excesses: extreme contrasts can end up looking disjointed. Another recommendation for everyone: be careful to respect the proportions.
There are different types of armchairs, it's true, but it's undoubtedly useful to list the main ones:
Chesterfield: the classic leather armchair with buttons, a low seat, and armrests and a backrest at the same height. Bergére: its signature feature is the high backrest with "wings."
As for modern models, it is worth noting that tradition often is the main souce of inspiration, the starting point for thoughtful reinterpretations. For those who have limited space space, there are compact armchair designs that are easy to place and capable of adding character thanks to the high-quality materials they are made from. You'll find everything in the product data sheet.