LP - everyone should get this. The lighting is great, looks very good. Better than most other new cars. On high beam they light both sides of the interstate and you can see forever. It is fun to see the lights swing around when making turns. Start up is impressive as the lights go thru an alignement test before settling into position.
DCC - first and foremost the R and GTI are performance based cars. They have a performance suspension. Even in comfort mode it does not make the car a cruising Cadillac. However, it might not be a Cadillac but I think it is better. My GTI is solid and smooth at 80mph. DCC allows you to feel more or less of the road surface. In sport the ride is still good but you feel more of the texture of the road. Not so much noise but more vibration. In comfort you are still well in touch with the road, just not having to deal with the road vibration. If you are under 25 then you might get by without DCC. Over 25 years old I started to hate driving on interstates with expansion joints in my Honda CRX. This is my reason for getting DCC. I am now 50 and do not want to hear my wife complain about why the ride of my new car is so bad. In Comfort mode my wife felt the ride was very good on the interstate.
PP - most cars I have owned always felt weak on brakes. The brakes on my PP GTI feel like the strongest part of my car. The brakes feel like they can easily pull the car down from any speed and hardly break a sweat. For this alone I would get PP. LSD - I wanted this for safety reasons. I likely do not drive fast enough to make the most of this but in rain, snow and bad roads I know the LSD will be there to help me. I do not know about base GTI but my PP GTI has no torque steer. The 10hp with PP package? More is always better. With brakes and LSD It is good to have more horse power.
What (R or GTI) is best to buy depends on you. What have you driven the past? Is 4 wheel drive a must? For me the GTI fills all my needs. If you can afford, get all the items mentioned, you will like them. If money a factor then I would get in following order.
LP
DCC
PP
If young and ride quality not important then swap DCC and PP.
With either car you will enjoy them. Solid and safe at any speed.