Hard cat carriers are usually more durable, which makes them a good choice. Cats can often get moody and not comply with being locked up. Sometimes,  the cat carrier is susceptible to a lot of scratching; so, having a hard-sided cat carrier makes it more durable, especially for a restless kitty. Though both have their virtues and vices, hard cat carriers are mostly recommended for traveling in cargo or an airplane. On the other hand, soft cat carriers might be less robust and durable; they are travel friendly and have higher portability, especially for someone who likes to travel light. At the end of the day, it all comes down to individual preference.