I happen to own all Matthews grip equipment, since that's what I've been used to working with for years. My go-to stands for still photography are: Matthews' steel baby rollers (studio), and Matthews' steel or aluminum baby stands (location). I think these are the three most useful stands in grip for photography. I don't ever need to boom out too far, so I've been very happy with Matthews' Mini-Boom. I own two of each of these:
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Matthews Hollywood Baby Jr. triple-riser, all-steel, rolling stand
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Matthews Mini Boom
I typically use one rolling stand/mini-boom for the key, and the second rolling stand/mini-boom for a backlight. I usually hang a 400Ws monolight with either a 3' or 5' octa, using a baby drop-down pin in a grip head at the end of the boom (the mini-boom also has a hook on the other end, where I hang a small strap-style shot bag for ballast). I bring these rolling set-ups to any location where there's solid, level ground.
I've used the larger Matthews booms when lighting for TV, and they seemed to work fine. But those are more than I'd care to deal with for stills, since larger booms require larger stands, more ballast, plus tie-downs. I haven't tried the Avenger equivalents--perhaps their designs might be better. I just bought a Calumet over-sized grip head at their store liquidation, and it's awesome (its main clamp is saw-toothed), so there may be better alternatives to the Matthews booms out there that I just don't know about.
For uneven ground on-location (grass, sand, etc.), I use Matthews' baby stands with Rocky Mountain (leveling) legs. The all-steel Beefy Baby stand allows you to use fewer shot bags, and rig larger lights or scrims at greater heights. I also like the aluminum baby stands because of their lightweight construction (but, they carry less load, and need more ballast). Note, however, if using a boom, the steel Beefy Baby stands are preferred since the aluminum stands flex a lot more:
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Matthews Hollywood Beefy Baby, triple-riser, all-steel stand
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Matthews Baby aluminum stand
For C-stands, I have all-black Matthews 40" double-riser stands, with 40" grip arms, plus one short C-stand with a 20" grip arm. I also have a pile of 15-lb. shot bags, which are more compact (but, a lot more expensive) than sand-filled bags. For lightweight location stands, I have a pile of cheap Photoflex stands (similar to Arri or Manfrotto lightweight stands) which work fine for Speedlights. When hanging 9' seamless paper, I just put two grip heads onto two Photoflex lightweight stands, and secure a 10' piece of 5/8" electrical conduit directly into the grip heads.