Cannot comment on the OP but as I'm in the same position looking at similar price for the same 1.5 engine, this is how I viewed the range. I've got 2 A6's and that's my problem, Mrs B5 needs/wants a smaller car. I'm keeping my A6 C7 for myself, but as the A6 is a DFP car we want something for shorter tips around town.
I know there are different manufactures but I'm sicking with the Audi brand, I never liked BMW, and don't like the interior of the merc, but the exterior of the merc's are very nice.. So these were the Audi Models I've looked at
A1 too small and dated interior.
Q2 same price as the A3 but discounts not as good Also the older 1.4 TFSI engine
Q3 Looks good, but the the interior & tech is back from 2012, also being replaced early next year (April time). However there will be very limited discount on the new model if any...
Q5 Too expensive, no good discounts
Q7 Too big, too expensive
A4 £8,000 More for the older 1.4 S line model, so that is out and would be even more with options (FL due next year from my understanding)
A5 Too expensive
A6, A7, A8 Too big, too expensive
So the only model left is the A3, it got FL last year, and is being replace in 2019, however it's just got the new 1.5 engine, the interior looks goo and up to date, and it has the latest MMI system. The A3 has grown up over the year's, it boasts most of the tech from it's bigger brothers, and the only lacking feature in my eye's is memory seats.
I also priced up the latest Golf and with the options I was looking at, it was only £2K cheaper, and no where near as nice to be in compared to the A3.
Only other option was the e-tron, but again that starts at £36K and you only get £2.5K government discount, if it had the full £5K then it would have been another option.
I hope in the next 7-10 years either battery tech has improved and I don't need to spend £100,000 on a tesla to get 300 miles from a charge, or people see battery powered cars for what they really are move to far cleaner manufacturing technology like hydrogen for example.