LR3 or LR4?

[lhwalker22]

New to the forum. I'm sure this has been posted before, so my apologies up front.

Just bought my wife a 2013 LR4. Wanted the V8. AND WE LOVE THE VEHICLE!
Now I want one too, but don't want to spend $45k again on a CPO. So I am interested in a 2010 with 60k miles or less, or just going for a lower mile LR3.

I know the LR3 has a smaller V8, and a much more "rugged" interior.
So, for those who have driven both extensively...

1. is the smaller LR3 V8 noticeably less of an engine? The LR4 accelerates with ease. Does great at highway speeds as well. Is the LR3 the same?
2. Does the LR3 drive so smoothly and quiet like the LR4?
3. Does the LR3 interior feel old, or is it really not that bad?
4. Anything else I should consider that I forgot to ask?

Spending $18-$21k on a LR3 is much more attractive than $27-30k on the LR4, but I will spend a bit more if most experienced LR owners really recommend doing so.

Thanks in advance to all, and we are so pumped to be LR owners! Really a vehicle like none other. Such a fun ride.