Overall servicing costs should be less expensive on a 550 than a 512 TR simply due to the fact that the engine does not need to come out to change the cambelts on the 550. If it is a 97 model year 550, make sure all the updates have been done (suggest you also read the Buyers Guide: Ferrari Buyer's Guides - Ferrari Life
) . They are very different cars and you really need to drive both to see which you prefer.
I saw the "overall servicing costs" point and it caused me, for the first time, to go back over and add up the 5 invoices for work done at the local Ferrari Agent over the life of the car so far.
Mfr. March 2006. 9,600Km to date.
Has had the following work over the 5 year period. No outstanding or deferred maintenance.
Annual service each year (following the check list, changing lubricants etc etc)
New Cambelt, Bearings and Pulley Tighteners etc (everything around this)
All interior plastic and switches "de-stickied"...refinished.
TPMS sensors replaced.
All 6 gas struts/springs including roof supports.
Clean polish/detail with each service.
Total cost = USD 10,800
Apart from adding the gasoline for 9.600 Km over 5 years, this does not seem too bad to me.
(I just spent USD6,000 on one (this years) annual service for my MB280E which is about the same age (although 42,000 Km)!
Thought you might be interested. Not sure how that compares or whether we can even compare costs for parts and labour in other countries?