To be honest I think everybody is a fan of the Oto.
Extracted from the font of all knowledge...
[ame="http://en.wikipedia.org/wiki/Global_Combat_Ship"]Global Combat Ship - Wikipedia, the free encyclopedia[/ame]
Weapons and systems
Royal Navy ships will use the Type 997 Artisan 3D search radar, Sonar 2087 (towed array sonar) and Sea Ceptor (CAMM) air-defence missiles launched via a Vertical launching system (VLS). Like the Type 23 frigates that they replace, Global Combat Ship will be equipped with a torpedo launching system probably utilizing the Sting Ray acoustic homing light-weight torpedos, or alternatively a next generation of Royal Navy torpedoes. In early 2012, BAE Systems released a "New Design" Type 26 Global Combat Ship that showed an additional 24 cell "Main Strike" VLS positioned behind the Sea Ceptor (CAMM) air-defence missile VLS. Different customers may choose either strike length Mk 41 VLS from the US (capable of firing the Tomahawk missile already in service on RN submarines) or the European SYLVER A70. The SYLVER A50 is the main weapon on the Type 45 destroyer; the longer A70 version can fire the SCALP Naval (MdCN), a derivative of the RAF's Storm Shadow cruise missile.
The Type 26 will be fitted with guns of various calibres.
Instead of the RN's traditional 4.5" gun it is expected to have a NATO-standard 5" main gun, either the Otobreda 127/64
or BAE Mark 45.
Smaller guns include two Phalanx CIWS, two 30mm DS30M Mark 2 Automated Small Calibre Guns and a number of miniguns and general-purpose machine guns.
(
UNDERLINES &
BOLDINGS are my emphasis, not Wiki's)
They're both 5" guns & are, believe it or not, about the same 'age' as the RN 4.5" gun, as they all started their original design in the late 60's !
Oto Melara Otobreda 127/54 compact 127mm 5 inch 54 caliber naval gun system
5"/54 caliber Mark 45 gun - Wikipedia, the free encyclopedia
4.5 inch Mark 8 naval gun - Wikipedia, the free encyclopedia
I've seen nothing on any of the major sources for info (BAE / Oto / RN websites, or even Google news feeds), stating if there's a preference and in fairness, I reckon that that's a good thing.
T26's design is still pretty fluid & IMHO, the gun is probably one of final pieces in the jigsaw, that will need a fair amount of investigation, discussion, clarification & end user buy-in.
As both guns are able to take the 'Standard' NATO 5" round, then it's feasible that the MK 45 will be able to fire the Vulcano round.
All that said, we can only wait in hope of a decision within the next year, as once it's been made hopefully the design can be 'frozen' & the build programme planned, dependent on the Scottish Independence referendum results....
SA