That Orbea is an excellent bike. Not a mainstream UK bike, but a real bike company with a pro-peleton presence.
Paul cycles are also selling TCR Advanced for £1099. This is a do it all race bike built around a frame that used to sell for more than the price of the bike. Tiagra groupset is no bad thing (but 105 11spd is a lot nicer) but the frame is outstanding.
Between the Orbea and the Giant sums up your choices; higher spec parts and a slightly lower spec frame, or vice versa. It’s not an easy choice and you’d be happy with either.
I’m not a fan of Planet X. Ribble are a better choice, but for me, a signed up giant fanboi, i’d pick the Orbea.