Surely all post 2008 2.4JTD are 210hp except for the Q-Tronic which were still 200hp.
I'm sure the 210hp didn't come along until 2008MY anyway...
So no you don't get more power in a Ti over the same year Lusso.
210 came in before MY '08, it was introduced with the Ti, but by the end of 2007 the other models were 210 as well.
The distinction being all 2.4 manual Ti's were 210 as it came in as a 'new' model mid 2007, whereas the Lusso's and Turismo's were already built and largely in stock, so werent advertised as 210's for a while while they shifted the 200's.
in MY08, Ti became a trim pack, prior to that the UK TI only came as 2.2/2.4/3.2 and in red black or grey, and you couldnt add anything to the spec.
When it became a trim, it lost the memory on the seats and few other gadgets, but you could then get any colour/engine, obviopusly with teh smaller engines you lose an exhaust pipe too!
For MY 2010, it lost the leather and brushed darkened metal for a half leathe/alcantara and rougher brushed black plastic (looking - it might be metal!) trim.