I just use whatever I can actually find. I hate all the seams along most tubes making patching more difficult, but they seem most difficult.

I find that many Dept stores now carry the 25mm 700c tubes, but inevitably are sold-out 90% of the time (whoever is stocking needs to do a better job).

I have a not-so radical aero profile, but the short stem tubes work fine, so I'd prefer a Bell short-stem tube than the super long stem tubes that are often available elsewhere.

My last Ribble order included several cheap tubes, although I'm still working on my current spares. As flats have slowed down, I've done less patching. If my glue dries up between uses, then it isn't much cheaper than new tubes.