G'day Katieh, welcome to MySwag!
Rather than asking the question this way, ask yourself a few questions that will help sort out what's best for you.
What's your budget?
Hard floor or soft floor?
How many people in your family?
Fully off-road compatible, or simple box trailer type?
Type of camping you prefer ie caravan parks only, or extreme remote stuff?
Any DIY stuff you're prepared to do?
No point telling you to stay away from a cheapy less than $10k trailer if a $50k + Kimberly Kamper or equivalent is out of your budget, or not to bother with fully independent suspension if you're going out in the boonies!
So tell us a bit about yourself and what you plan to do with your trailer and you'll get more advice you can poke a stick at!