I normally use Blurb for photobooks.
I’ve only had one aluminium print done, got it done by Zor.com who were significantly cheaper than everywhere else and the quality is excellent, although I’ve nothing to compare it against due to only ever using them. Only issue was with the usually reliable DPD who decided that they couldn’t deliver it to the alternative address I’d requested, dumped it in the corner of their depot and didn’t bother to tell me [emoji52]