Heres my twopence ...
It depends what you want, you have had the motor 5 years and presumably have spent a lot of time underneath it and fixing, maintaining and generally pratting around with it you should know it pretty much inside out, how its been stored/driven/abused/serviced over the last 5 years and what to expect bodywise. Some say the 3 door 200s are the more desirable as they are becoming rarer, 5 door 300s like mine are everywhere but tbh (300 facelift) id rather have what ive got to what you have but thats just personal preference. Your probably a lot more knowledgable about landys now and so should know what to look for but you could still buy somebody elses problems with no idea how its really been looked after.
Ive had mine about 4 years now and knew nothing about Landys, now ive just spent FOUR MONTHS

getting all the rust sorted on my landy but the way I see it is it can now last forever (the old trigger broom joke: Ive had the same broom for the last 14 years, ive only changed the brush 5 times and the handle 3

) and my 9 year old lad has got his eye on it for his 1st car so its gotta last another 8 at least
Just thought I would add when I say 4 months it could have been done much sooner but there was A LOT more work than I had anticipated. Have a good look under the carpets, boot, bulkhead, inner wings, rear wings, battery tray, headlamp boxes, sills, chassis etc etc etc and then make your choice, you may not have a choice......