I appreciate you don't have details of the existing amp/setup, but I'm sure you'll appreciate I can't give you a definitive answer without more info.
I'm not familiar with the KDA20 amp, but the specs suggest it has a variable output.
It's wideband, so the specified gain figures are a guide only, as it's likely gain is different at different frequencies, but yes, typically from 10-20dB gain.
Of the two options, that would be my pick, with a 3-way passive splitter. Naturally, signal at the amp input, length and type of cable to the 3 outlets will vary the result.
Depending on how much signal output there is on the existing 2-outlet amp, just adding a passive 2-way splitter to one leg may be sufficient, especially with RG11 cable.
Personally, I would go with a UHF-only 20dB distribution amp at the antenna and use a 3-way splitter.
That way, you are rejecting unwanted signals which can interfere/reduce signal performance because wideband amps have to be de-rated as they amplify everything in the bands they cover.
Option 2 powered splitter has higher UHF gain then VHF, but from memory, they have a high noise level, which isn't provided in the specs.
It basically will provide a slight boost to each leg to compensate for the insertion loss.
Again, without accurate signal measurements, it's a very general suggestion.
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