First Road Bike .. Trek Emonda ALR5 vs Canyon Endurace AL 8.0

I have no doubt that you'll enjoy the Canyon when it arrives, it’s a very popular bike and atractive due to the kit that's on it, however you missed out on the ALR. Not only is it the lightest aluminium frame on the market right now (it’s also lighter than the entry level carbon version) it also looks like a carbon bike due to the hidden weldswhereas the Canyon looks like an aluminium bike (big ugly welds). There are also no issues with the bottom bracket they chose to use on the bike btw - I know from experience.

Thanks Hassan.

Sounds like a great pedal choice.

It is going to be a LOT of fun riding that bike.
Enjoy and be a little careful on your first ride or two!

I just say that because when I got my first road bike, I had past
experience only in mountain bikes...and for the first moments of
cycling it was a little unnerving...then in next day I soon learned
that with the thinner tires of road rike, you come off easier if you
pull the brakes hard and skid sooner than you expected.

It's super fun, but it feels very different to mountain bike, almost
like skating on ice if you skid.

Within just a few days you get to know the bike better and are much more safe.

A great thing also about a road bike is the way over time it continues
to feel like it is growing with you. I think you will love this bike
immediately, but, in a few months time, I
think you will love your bike MORE than even those great first many
days (weeks, months..) you cycled with it.

It will seem like your bike is magically getting better and better (as
you are getting better and suddenly finding yourself able to get more
out of the bike).

Congratulations and enjoy

Great. Don't worry about the minimal assembly required. It's easy attaching a front wheel and handlebars, even if it's your first time. Just make sure you have some pedals ready to fit on the bike as they are not included as I'm sure you know.

My choice would be the Canyon:

1. Wheelset: Mavic over Bontrager. Mavic are rugged and last a long time. The only issue with Mavic's is serviceability of the pawls.

2. Tyres: No brainer, Continental all the way!

3. Groupset: This is close but would choose Ultegra over 105 groupset mainly because Ultegra is 2nd tier, 105 3rd tier.

4. Bottom bracket: Shimano over Trek. Shimano has external bearings, Trek is pressed fit (PF). On lower ranged bikes PF's have a reputation for squeaking/squealing as frame tolerances aren't as spot on as high end bike frames.

Study bike fit and frame geometry. If you have a local bike shop go ride the frame size fit calculators say is your size. Then ride ride a frame one size smaller. This is a good way to decide which size feels most comfortable.

Unless the Bontrager wheels are significantly better (?) than the Mavic Aksiums (which I always hear people say are solid but not particularly light or remarkable), it would seem hard to root for the Trek when it's going to cost $260 more. The Canyon seems to be about 1/2 a kg lighter (if specs are accurate) and has the Ultegra (slightly lighter/superior to 105) to boot.
Of course you'd never know which bike you thought was better/preferred without riding them both but sounds unfortunately you don't have that opportunity.
Most likely as the first responder said, you cannot go wrong with either of those.
Probably two very similarly great entry professional bikes.
In your position I'd probably only select the Trek if cosmetically I liked the colour and look more than the Canyon.

Never ridden the Trek but I can only say good things about my Endurace.  It looks great, rides well and, after eighteen months, nothing has broken, misbehaved or even gone out of adjustment.  Super value.

Both of these are brilliant brilliant bikes, you can't go wrong. The Emonda I have ridden and it feels like a much more expensive bike. If your first bike is one of these, then you are very lucky indeed.