So, the Tygr 300R is just the DT 990 at 32 ohms with it’s respective black pads named “EDT 990 VB”, some foam you find on the amiron home placed over the driver, a different housing, and some very minor other changes inside of the driver. It’s definitely not just the pads causing the difference… the pads aren’t the ones taming those highs to a large degree it’s that foam insert as we see this exact same thing with the new T1 third generation as when you remove that dampener it’s brightness goes from dark sounding to quite bright sounding.
x2hr I would skip unless around $80 or $90 as it has been known to sell for.
it’s a bit harder to explain when it’s the HR version of the x2 as that is also a warm headphone much like tygr.
highly recommend an amp later down the road then… even if it’s just a cheapo amp dac such as like a $60 Fiio E10k as those can power up to 250 ohms.
So, the issue here is technically I really cannot answer this for you. Only you know your full on preferences… the headphones are both a warm signature… x2hr has more present mids and balanced out treble however, it has bass that’s uncontrolled, muddy, loose, and bleeds into the mids meanwhile tygr has slightly recessed mids treble that dips under neutral but peaks above neutral giving an impression that it’s slightly V shaped with an increased bass that’s controlled and raised to close to the perfect degree as it stays out of the way for competitives. Both are great, I would highly take the tygr over the xh2 for not just sound quality but build quality though comfort would be more subjective because x2hr has a lot of padding to it. If anything you could always upgrade later and pick up the x2hr first see if you like it or not… find a return policy on the items and sit down with them for a few days would be your best bet in that regard.