Rolex has launched six models at Baselworld 2019 - all in dual color or Rolesor.  There is the Datejust 31 mm in Oystersteel and yellow gold and the other is in Oystersteel and Everose gold.  There are two strap options - the Oyster Bracelet with the Oysterclasp with Easylink comfort extension links and the Jubilee bracelet with concealed folding Crownclasp.

There are significant differences in the bezel, use of diamonds, the hour markers and dial coloring throughout the 5 models. However the design of the case remains consistent.  The case is waterproof to 330 feet with its Twinlock double waterproofness system built into the screw-down winding crown.  All Rolex timepieces are covered by the scratch-resistant sapphire crystal.  These DateJusts also feature Rolex's signature cyclops lens over the date aperture at the 3 o'clock position. 

The biggest feature difference that separates these new 31 mm's from older models is the new 2236 caliber movement with a 55 hour power reserve.  The Perpetual rotor self-winds bidirectionally.  It has a Syloxi hairspring in silicon and high performance Paraflex shock absorbers. The Syloxi hairspring provides stability and resistance to temperature variations - providing up to 10 times more precision than traditional hairspring in the case of shocks.  

The geometric design also ensures regular precision in any position.  It has all the basic features you would expect in a DateJust including the centre hour, minute and seconds hands.  It has an instantaneous date window with rapid date setting.   It also has a stop-seconds feature for precise time setting.  

The two models just above feature diamonds around the bezel and there is a diamond for each of the hour markers other than at the 3 o'clock position where the date window appears and the 12 o'clock position which features the Rolex crown.  All of the diamonds are surrounded by 18ct gold to prevent tarnishing on the dial.  

My preference for the first timepiece above, featuring a Rose colored dial, Rose gold and Oystersteel Oyster bracelet and fluted bezel is primarily because of its simple look.  I personally feel that the Jubilee bracelet pulls so much attention away from the timepiece, especially when the timepiece is adorned by diamonds throughout the dial and bezel.  Also the pink gold Roman numerals for the hour markers looks elegant against the Rose coloring of the dial. Of the diamond studded case designs I feel the 5th option above with the silver dial, Oyster bracelet and Rose gold and Oystersteel combination makes this a nearly perfect timepiece with no distractions other than the beautiful gemology used in the making of this timepiece.