Inner Tubes. Probably a dumb question but....

I run 28mm tyres - actually on the bike I have 18/28 tubes. In my pocket I carry 28/45s...

Why? Because I mostly ride with chaps who apparently enjoy hammering their prostates on 23mm tyres pumped up to infinity PSI... One of them keeps puncturing but never carries a spare tube, patches or a pump & I got fed up providing tubes that he always promised to replace (still waiting on any never mind all). Now I can't provide him with a tube so either someone else can, or he's on the walk/call of shame.

Forgetting once is forgivable, twice starts to look careless, thrice is extracting the weewee.

Doesn't seem to matter. I never check the size of the tubes and they still work in 25s on wide rims

I'd go for the larger size even though there is a small risk of snagging it during fitting.  I reckon that the smaller one will be inflated to its maximum size and stretched to the limit, a bit like a balloon.  This means it will puncture more easily than the larger one that should be more relaxed.

Well, that's my theory anyway ......

On the other hand if you are fitting your 25mm tyres onto a pair of  newer, wider rims the actual measured width of the tyre will be up to 29mm. In that case a 25-32mm tube may be considered more appropriate, especially on a tubeless ready rim where the well is deeper.

Agreed, much easier to fit.

In my experience I find that the 18-25 are esier to fit than the 25-32 as the larger inner tube I find is easier to pinch when fitting. So I would go for the 18-25, which is what I use as I have 25mm tyres.