I think the differences between the A45 and the GRY will surprise you, in a good way.
The GRY will be far more engaging to drive, especially if you have it geo’d properly. It’s a car that responds well to refinements in its driveability and giving the ergonomics an overhaul definitely puts it into fun/weekend mode.
The A45, as a daily, will do all the things that the GRY can’t (or certainly does very poorly); idle in traffic, cruise along motorways, it has more comfortable cabin, easier to live with (getting people and stuff in and out). You can also win traffic light Grand Prix and frighten people with the stock exhaust (if that’s your thing).