I highly doubt that asrocks full spike protection can help against a thunderstorm. Do you have any source on that? There are worlds of difference between that and protection against a faulty psu.
Get the Gigabyte, and a Mehrfachsteckdose mit Überspannungsschutz, according to https://www.test.de/Steckdosenleisten-Viele-sind-nicht-sicher-4248836-0/ the APC Surge Protector is fine. It costs 19€ on amazon: https://www.amazon.de/APC-PM5-GR-Protector-Überspannungsschutz-Essential/dp/B00TAS2E84.
I'd take a closer look at the power supply. Try using another or buy a cheap one (if you don't have it) just to see if it was really the PSU and to verify that other components haven't been damaged.
Talking from experience: newly built PC with all new components, dies 2 weeks later (Corsair TX650M 80+ Gold). Switch in old Enermax Pro, everything's fine. Buy another Corsair TX650M, dies again after a while (with sparks, a loud pop and sparks).
Figured it was probably the socket that was faulty (even though the Enermax ran on it for a while and didn't get fried). I got myself this cheap multi socket: https://www.amazon.it/gp/product/B00TAS2E84/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 and never had a problem in 4 months (also using the old ass Enermax Pro PSU that hasnt even a 80+ gold certificate, its only 80+, not even bronze).
https://www.amazon.de/APC-Surge-Protector-Steckdosenleiste-%C3%9Cberspannungsschutz/dp/B00TAS2E84?th=1 This one, only been manufcared for 5 years but I bought it less than 2 years ago so it's relatively new.
Ja mislim da ti je pametnije uzeti Surge Protect kao npr ovaj.