I have been doing many experiments to find out which one is more suitable for those big cinematic scores. If this is the category you are looking after then my overall impression is as follows:
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is a hard nut to crack. It needs tweaking, equing as well as practise. LASS 1 was too detuned as compared to LASS 2 and at that time you had to work more on that. But I like the LASS 1 sound which used to give more expressive results. For more better result, there is a learning curve to it. Can't say about LASS 2.5 as have yet to upgrade. As far as your test for LASS goes, IMHO, it seems that the soundstage/scape is smaller but clear. There is a room for improvement to make it sound bigger. The legato sustains are exceptional sounding with that crunchy realistic Hollywood type of sound with a bit of 'metallic' image. The inbuilt attack is much more faster which contributes to more realism for fast lines.
is a very strong string library requires less tweaking and even sounds perfectly well out of the box. It requires less efforts to make it sound big. Learning curve is lesser than its contestant. In your test, IMHO, it has bigger soundstage/scape, rounded and fat, boomy bass, a very little bit on the muddy side and less expressive due to slower attack. It has that natural lushness and stereo image which CS always seems to claim and which is true. Less time consuming for a better result.
Its hard to sum up which one is better; both are perfect libraries on their own. Then comes your taste and choice. I will choose LASS over CS in this particular piece and many other.