Plano is inexpensive in North America, which is its greatest draw. It was my first pick, and remains a good option for
ASLSK. I still have more than 60 (empty) 3500 cases, and four or five of the carry cases for these. (I preferred these smaller Plano cases due to their smaller footprint, having witnessed too many of the large Planos tip and spill during play.)
However, IMO, Raaco wins hands down for storing MMC, and 1/2" counters in general. Hozan's smaller compartments allow better flexibility for storing vehicles and 5/8" ordnance. But as others have mentioned, Hozan does not hold up well for travel. If you don't attend many ASL events, Hozan remains a good option. I opted instead for Raaco.
Another thing to consider is using more than one type of container system to store your ASL counters (e.g. Raaco for 1/2" counters, and another type of container, say Hozan, for the 5/8" counters).
Some use coin envelopes for vehicles. Others swear by matchboxes for their entire set. But much also depends upon how you plan to organize your counters.
If you want each vehicle type to have its own compartment, for instance, this ought to influence your buying decision. There are, of course, workarounds, as others have noted. One can divide a compartment using plastic, or paper cards. See Oliver Gray's Raaco system
here. (Scroll down and click on photo with caption "The complete gentleman.") Olli uses labelled cardstock to separate different AFV from each other. The photo shows parts of four A75 inserts. Each tray/insert has five compartments, and each compartment can hold about 40 5/8" counters on end, or ~200 counters per tray, or 3200 counters per Assorter 55 case.