It's a little weird that they are the same price up there. Here in the states the newest Kaby Lake Spectres are at least 200-400$ cheaper than the 13" with touch bar. The big difference being that the Mac uses a full dual core chip I believe, and the Spectre uses a ULV chip. In all of my testing I haven't noticed a lot of difference between the two chips, both dual cores with HT in the 13" models.
The newest 13" Spectres are very nice, about 2.8lbs I believe, it really depends on what you like more, and it could just come down to which OS you like more. Do you absolutely have to have macOS or Windows? I really like both Sierra and Windows 10, so for me personally it comes down to what I need more, I'm a MS developer currently so MS is the obvious choice, but I really like both, both are great and hold their own in just about every category.
Another consideration is that the Spectre can be used as a tablet and does very well doing so, the mac not so much. If you were looking for a system to be your one and only, laptop + ipad replacement, Spectre wins.
Edit: Sorry I misread the first time, I'd think the Spectre might outperform the mac a little if you go with the non-touch bar version, I believe the CPU is quite a bit lower clock speed. The SSD speed will be comparable in both, the newest Spectre has an NVMe SSD, quite fast.
