Had the 4 Cadi horns. I personally don’t believe they live up to the hype. They also block a ton of airflow to the rad if mounted in factory location.
Switched to red Hella horns, the sound is much less pleasant but far far more effective at getting other drivers’ attention. They also seemed to allow other drivers to localize the sound better than the Cadillac horns which just seem to be omnipresent.
OP, what’s your goal? Safety or just outright being obnoxious; no judgement either way.
Also, the train horn builds (when done right) are $$$. A lot of money for a novelty, which does less (in my opinion) to get the attention of a distracted driver and instantly distracts every other driver in a 1 mile radius - which is fine if you’re just looking for outright attention.
In the end, I believe the money would be better spent on useful mods and maintenance, and becoming a more defensive driver so you won’t need to rely on your horn as often.