Well I own neither, but relying on my ears alone, I'd go with LASS. Hollywood Strings sounds great, but like the title suggests, it seeks to capture the large, washy and piercing strings of Hollywood, something that I'm not really looking for. I prefer a more intimate sound which I believe LASS has. LASS also sounds like it gives more space to the mix, meaning that the sound is more focused. Whereas HS is much akin to the strings in their symphonic collection which seems to spread itself over everything else.
What would be really ideal is to have both, so when the music swells to climax you could switch to Hollywood Strings for that free, expansive sound, and switch back to LASS for all the parts that need a warmer, more crisp quality.