I hope I'm not out of turn here but I agree that the setting out could have been worked out far better, especially on the floor. Normally you set out to extreme furthest points so in your case one edge would have been under the door so there shouldn't be a need for 'slithers'. Now that you have what you have, slithers are the only option but shouldn't look too bad.
As for the corner of the shower, it drives me nuts seeing tiles running out with deminishing cuts, thats usually because the walls aren't plum but can easily be sorted in the prep stages or by bedding up adhesive sometimes. Okay this takes longer to do but the finish is far better for you the customer. Did this guy board out the shower area first because if so he needs a new 6' level!!
Regarding the Silicon beads within the internal corners, this has to be done to comply with building regs anyway but yes, go with the best
tile colour match however, whatever you do, please make sure your man can Silicon up neatly otherwise it will just destroy it all even more. The last thing you need is to have green Silicon smeared all over the place!!
Finally, pricing...... Did you only get the 2 quotes? We're these people recommended?
In future get references, talk to people and even be cheeky and ask if you can see people's previous work. If you get to see their work then you can make judgement yourself.
I've seen pictures of people's work that they themselves use to advertise their services but it's absolutely shocking. Unless you're in the trade then you probably wouldn't see or notice some of the rubbish that's produced and so even some customers themselves just see shiny new tiles on a wall and think it's the business when in fact, it's shocking!!
I hope you end up with the finish you want and everything goes well.
Stu
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Oh, one other thing......that bath fitting price, I have just quoted to refit a bath for someone, albeit back in its original place.....£90 including Silicon and tap connections and I will even fit the wall mounted tri-fold shower screen too.
No more than 3 hours work Saturday morning. So, £300 for this guy to move and fit a new one 200mm away OMG!! Even if it takes half a day, that's one nice income!