As I said, I have that Hartke cab and I highly recommend it. It sounds great and is built to last.
Downside is that it's heavy.
I have no experience with that Ampeg cab. But judging on the specs... it's lighter as the Harkte.
SPL rating says it's about as loud.
The Ampeg has a tweeter, so it has a more high-end tone. Though you can just turn the tweeter off.
Compared to the Hartke, the Ampeg would go as low and deep.
The Hartke 410XL performs like a beast in the low end and low mids. And... it doesn't even sound dark. It has alumium drivers which give a clear tone.
(Although to me aluminium drivers are not a selling point anymore, there are so much better things on the market these days but more expensive.)
Also, just as a monitor you might get away with a smaller cab. A decent 15" maybe? or 2x10"?
Good luck with whatever cab you end up with.

And don't worry about your english, it's not my first language either.