I started off with a 4 drawer Preston on box then moved to a daiwa sb150 (and the back legs collapsed on it) so went and bought a Preston d30,after loading them up with stuff the daiwa felt the lightest the d30 the heaviest but it is the most stable out of all of them and the best looking also having a removable bottom box is a big plus
got the p25 myself and its cracking box, light and stableNo such thing as "best", you need to choose one that suits your needs, different people will have different requirements, for example, I've got a Matrix F25, I got it because it's smaller and lighter than most boxes and I need to transport it long distances, so it's ideal for me, but it won't suit everyone.
I also have the Signature venue system for when travelling light, fantastic bit of kit, with the bonus that it interchanges with the main box.
Still got one, with Octoplus leg system. I haven't used it for at least 20 years. It is gathering dust in the garage.