I have used both Lacrimosa and Insolidus, but not Silka. Personally, I didn't get along too well with either of them, but that's more of a taste thing.
Lacrimosa is pretty decent and pretty massive, being the size of choir it is. While the lack of SATB effectively means you at least double the choir size when playing more than one note (if you divide male and female choirs, that is), it doesn't really get as negatively affected by this as Majestica is. Though myself found the size more of a burden than a boon for my sort of music, and while it can do soft and delicate, I didn't find it to do it particularly well.
Insolidus is the exact opposite, being a smaller choir focused on soft and emotional music. It has a rather dark, heavy sound which I found to quickly get muddy with what I was trying to use it for. But, that's entirely a matter of opinion on my end and I can see this working well for others. In fact, I have used it well myself before, it just didn't cover nearly as much ground as I wanted it to.
If you want a different option to look into, Strezov Sampling's Choir Essentials might be worth it. Currently it's not on sale, but whenever it does, it might be at a similar price as the rest of your options if not lower. I have the full version of Wotan and Freyja (which CE is based on, along with a couple other choirs of theirs) and their versatility really can't be understated.