Errm, sorry David but you need to buy the one YOU LIKE.. Both machines work well and will do the job...the rest is just bling...
Plumb in kits for semi commercial machines that start out as resevoir models are a compromise and you have been given the correct advice ie we do not "recommend" them for various technical reasons.
However, just going on your comment about small drip trays....machines that are converted with "plumb in kits" just end up with a mains water connection.... they do not end up with a drained drip tray, so in the case of machines wirth small drip trays, you can end up in big trouble ( bigger trouble than before the conversion to the mains). *
You could try modifying the drip trays, but I for one do not buy new equipment so that I can bodgy it up trying to modify something that should have done the job straight up!
If you want plumbing then yes, a dedicated plumb in machine is the way to go and it will have the drained drip tray as standard....but remember for your trouble, you get a *machine that is then rendered static and cant be taken on holiday with you. Dont laugh, its a serious a consideration and you dont necessarily want to hold on to another machine such as the botticelli, for the portability it offers....
For the rest of it, please see your PMs.