I think download-to-own is a key area where anime really needs to catch up - I think in the UK at least, Manga Entertainment are the only distributor that really pursues it? I've yet to take the plunge though, because those titles will more often than not already be available streaming, and I'd be using the same device to watch them anyway - so why pay more? Perhaps that's one downside of SVOD being so prevalent with anime. I'm not sure I trust, or really see the point of, Funimation's digital codes either. I'm fully expecting that when they lose the rights to a title, they may (accidentally or deliberately) cull the digitally-owned version too - although I really hope not.
So, when it comes to purchasing, I still buy physical Blu-rays - although space is certainly becoming a consideration!
For manga and light novels, the greater availability and choice of digital platforms means that I've adopted a policy of starting any new titles digitally where available. For things only available physically, or that I've already started buying physical volumes for though, I stick to buying the ol' dead trees.