So what if you want to blitz in Strategic mode. (I have never done it)
What fleet do you need to take down a lone Star Base?
Run some fun test combats:
* Only starting techs of laser, nuke, and nuke bomb + standard tit armor.
* Green crew unless stated otherwise.
Remember ships stats:
FF - 1 beam - 4 structure /4 armor - 30 PP
DD - 2 beams - 15/12 - 105 PP
CA - 2 beams, 1 missile, 2 bombs - 25/30 - 375 PP
BB - 4 beams, 2 missiles, 5 bombs - 40/50 - 900 PP
Started safely with 2 Battleships (green crew) vs 1 Star Base (assume it is reg crew like in tactical):
Mostly this is a win, whereby 1 BB is lost.
I did have 1 'draw' in 10 attacks. where 2 BB's are lost and the SB too is lost.
However, if the SB reaches 1 higher crew level of veteran, I also observed some cases of losing both BB while SB survives.
Replacing 1 BB for 2 CA gives same good chances to win.
Going to the fight with 1 BB + 1 CA + 1 DD is a hopeless scenario
1 BB + 1 CA + 2 DD + 2 FF is a good fleet to win against the Star Base, but some ships will be lost.
1 BB + 0 CA + 3 DD + 2 FF is not enough and very frequent losses with this fleet.
Then, I am interested if you can win the fight with a "2 CA + something" fleet:
I did get some wins with 2 CA + 3 DD + 2 FF, but chance is low and there a frequently losses or draws.
As soon as SB gets a higher level crew experience, you can forget it all together.
If however SB is still reg. and your fleet is reg. too, then it is a somewhat more reliable win with 2 CA + 3 DD + 3 FF.
But in a real game, I doubt I would play this, coz it is high risk of losing many ships, and you can forget about a decent blitz time altogether.
To have less dependence on SB crew experience level, a good fleet is:
3 CA + 3 DD + 3 FF. Cost of this fleet is 1530 PP, which compares favourably to the 1800 PP of two BB's
Offcourse command points are 18 versus 8 from 2 BB, so money will be an issue with this fleet.
As said, with 2 BB fight it is common to lose 1 BB, which costs 900 PP.
The 3x CA,DD,FF fleet can lose between 240 - 1125 PP, and on average losses seem to be somewhat lower than 900 PP.
Strategic puts some interesting challenge for a Blitz, mainly the absence of retreat option.
In tactical if you arrive with some minimum nuke-boats, if defender suddenly has ECM or some other new tech, you can just retreat and come back with an extra CA. In Strategic, if an opponent completes a tech upon your arrival or his crew level goes up by one, suddenly you can lose much more ships, or worse even the whole fleet can be lost.
Also, as a zero-loss combat does not happen often at all, throughout the entire game you must keep spending resources on building ships to keep the minimum fleet in tact.
Note that I haven't tested exhaustively, could be some inaccuracy due to low number test runs, but I think this gives some first indication of fleet value in strategic.