It's an easy trap to fall into to be honest, and depends on what type of scape you think you'll be aiming for in the long run. I've pained and strained over the hardscape in my last couple of scapes, only to see it gradually and eventually disappear completely from view under the plants.
If you are aiming for a lightly planted, hardscape dominated layout, and plan to keep the plants well and hard trimmed back to keep it exposed at all times, then some decent looking pieces of wood and rock are good. However if you think it's more likely that the plants will dominate in the longer term, then base your choice on getting the right structural shape, and less about aesthetics of the individual pieces.
I know from my own perspective, on my forth coming rescape, I'm going to be caring a lot less about the hardscape detail, and more on just getting a convenient and balanced overall layout, knowing I likely won't see most of it in 4-5 months time.
Incidentally, if AG or Riverwood don't have quite what you are looking for, I've bought a lot of pieces from TM Aquatix on eBay. They are good value, and very helpful (and have pieces of wood individually photographed):
www.ebay.co.uk
I recently bought a big box of black lava rock from them, and asked if they could curate what they sent so only pieces of around 100-200mm were included, and with rough and interesting non-uniform faces to the rock (a lot of lava rock can come out rather uniform in shape) - yeah, I know customer from hell!
😛. Sure enough though they curated the entire boxful for me to suit, and almost all of the pieces look great: