€2501 is a pretty massive budget for a monitor of that size and resolution. At this price point, I'd consider decent color (read: IPS) non-negotiable. Since you mentioned gaming and programming (not content creation), I'm guessing perfect color isn't too important though. For that reason, I focused on providing a better gaming experience.
With both of these monitors, you get a 75Hz refresh rate with Freesync. IMO, these features make gaming (even relatively casual gaming) much, much better.
Beyond that, compared to the Dell monitors you suggested:
- ≈€30 cheaper (about €125)
- Slightly thicker bezels
- Slightly worse out-of-the-box calibration
- Some backlight bleed
- Fewer creature comforts
- (Monitor-dependent) No built-in speakers or USB hub
Given how much room you have left in your budget, it should be within your budget to get a nice USB hub and set of bookshelf speakers.
Between the G and HT models, the difference appears to be in vendors (BestBuy carries only the HT, the G is carried more universally) and inputs (the HT has 2x HDMI and 1x VGA, the G has 1x DisplayPort, 1x HDMI, and 1x VGA.) I'd recommend the G if you can find it (DisplayPort tends to have fewer issues with Freesync.)
- I don't know know where you live or what actual prices are as a result, so I'll be using USD and converting.