Dear Loiuse,
I'll try to answer some of your questions. As a frequent visitor to Disney Parks I hope I can give you a good impression. And I've been to DLP, which helps ;-).
<i>Which is a nicer resort?</i>
You have a choise of 3 categories:
Deluxe:
Disneyland Hotel (Very cool, above the magic kingdom entrance....)
Hotel New York (Little weird, but beautiful colors)
Moderate:
Newport Bay Club (Similar to WDW Yacht & Beach Club)
Sequoia Lodge (Nice woods, surroundings)
Value:
Sante Fe (Mexican Themed hotel, although the feeling doesn't quite come across)
Cheyenne (Western themed hotel, and a very good working theme here)
Depending on your needs all resorts are worth visiting.
I'll give my opinion about the resorts...
-DLH
Very beatifull resort, resembling the Grand Floridian in WDW, but looks like it is an extension of Main Street. Extremely good location, above the turnstiles of the Magic Kingdom, with a lot of rooms overlooking the Kingdom, which is very cool.
Is also very close to the new Studio's (5 min walking, which is nothing).
-HNY
First hotel after Disney Village (like Market place in WDW but smaller, which you have to walk trough to get to the hotels). It has a lot of color and is very nice. Very close to the entrance about a 6 min walk.
-NPBC
In my opinion the best hotel. It is a moderate hotel according to all brochures, but it really has the same architecture, atmosphere & looks like the Disneyland Hotel, which makes this one a cool place to stay for less bucks. It is about 15 min walking to the parks, but the walk is very nice, because you walk past the Lake (not a very big one).
-SQL
One big building and 5 smaller ones, all surrounded by large trees. Very nice hotel 12 min walking from the parks.
-SF
The least of the hotels here at DLP, the mexican theme-ing doesn't quite do it here, remember, paris is not a mexican desert.
-C
Cheyenne is very cool for kids, because this value hotel has a good working western theme. Also the rooms can have stack beds and one queen bed. which kids tend to love.
There is also Davy Crocket Ranch, but I don't concider this a hotel because it has living cabins.
<i>How far to the park from the hotel?</i>
It is not far from any of the Disney Hotels, not comparible to any of the WDW hotels for instance (where you must take the bus or monorail). In Paris you can walk to all hotels.
All hotels offer a very good walking distance to the park. And some are interesting walk's.
There are also busses which go to the parks, so if you are tired of walking take the bus.
<i>How long do you spend at the park?</i>
Magic Kingdom is similar to WDW, but has a littlebit less attractions so if you want to do everything I suggest 2 days for absolutley everything.
Park highlights:
Space mountain is cooler then all other Space mountains in the world. 3 inversions...
BTM is also cooler then any other BTM in the world. It is larger, more beautiful themed and rides faster.
Haunted Mansion is also more beautiful themed although the language spoken inside is french it doesn't degrade the attraction.
Walt Disney Studio's is about 5 hours tops.
It is very new and a very undeveloped park (yet). It will get much more interesting as this parks develops. But for now, you can just do it in 1 day.
<i>Should we arrive, go to the park and then spend our night, or arrive late spend our night then go to the park the next morning?</i>
Hey, I always go into park right away.
<i>How long does it take to get to the park from London?</i>
Flying is about 45 min.
<i>From the Paris airport?</i>
Subway transport from the airport is about 90 minutes.
The subway stops in the middle of the resort, between the Magic Kingdom and the Disney Village. Bus stops for parks and hotels are here and can take you to your hotel right away, unless you are in the DLH which is 1 min walk.
<i>What is transportation like from the airport in Paris? </i>
Dunno, I always travel by high speed train from Holland. which takes about 4 hours to get to Paris.
Hope this helps

.
Dion