I can answer the question with a few facts and then with my opinion. Many people consider the T series to be the best of the commercial BHPs with an external extractor. There are however T series and then there are T series. They are not all the same. All poodles are dogs not all dogs are poodles. The T series was introduced in 1962-1963. The "T" is nothing more than an inventory control aid for FN. Just like when they changed to the C series. By the time the T series was introduced FN had already moved to salt bluing. They were no longer doing the rust bluing on the earlier BHPs. They did this to speed up the process. The salt blue used by FN produced a black-blue finish which is a major appeal of the "early" T series guns. This is the deep blue that people prize.These guns hand a high level of hand polishing as well as a high level of hand fitting and finishing. This ended somewhere in 1969.
This is where the waters get muddied and this hand polishing and higher level of fit and finished ended somewhere in 1969. T series frames and slides were used up until 1972. C series frames and slide appear in 1969. The transition from T series to C was not a single point in time but about a 2-3 year overlap where both were produced. Again the T & C designation was nothing more than an inventory system for FN. It did not denote a fundamental design or production change.
At some point in 1969-1970 FN stopped hand polishing BHPs. They went to an automated polishing system to speed up production. Bluing then changed over to electrolyte bluing. So what is the difference between a 1969 T series and a 1969 C series? The answer is a letter. Nothing else. However people will pay more for a 1969 T series than a 1969 C series because of the believe that they are the same as guns produced from 1962-1968 with hand polishing and salt bluing. To make matters worse some T series made in 1969 will be salt bluing. Others will not. If you are buying a 1969-1972 T series you have to look at is closely before paying a premium. I would not buy a T series post 1968 and pay a major premium for it. Earlier T series are more sought after by knowledgeable collectors. Later Ts are really no different than C series guns except that they always have a ring hammer.
So to answer your question IMHO a 1962-1968 T series are the pistols which are the cream of the crop. They are the best of the batch but only from a collectors standpoint. They are not any more accurate than other BHPs. They are not as durable as a forged frame MKII or MKIII. They are definitely not as durable as a cast frame MKIII. They have a poor safety and they have poor sights. They are in all honestly not great shooters. To turn them into modern shooters you have to modify them ruining their collector value. They make wonderful safe queens but if you are looking for a working shooting pistols they are not a good choice IMHO unless you are going to customize them.
Another thing that also makes them prized as base guns for customization is that the serial number on the frame is located just under the ejection port. In 1971 the serial number on the frame was moved to the grip strap. If you are looking to customize a BHP with checkering most smiths will not move a serial number so they will only checker a gun with the T series or early C series location. The other exceptions are Practicals and hard chromed pistols. Something about the hard chromed framed causes them to use the T series location.
Yours is a beautiful example. Enjoy it. It originally came in a leather pouch. The *W is an inspectors mark which was used by Nicolas Wolfs from 1952-1968. That means that the barrel and the frame were inspected before 1969 when the *W was retired. These codes tell you when it was inspected and approved but not necessarily when it was assembled in 1968. You often need to put the pieces of the puzzle together to accurately date a BHP. Most of the "charts" do not account for the overlap or account for FNs lax record keeping.