The blades of Astra are among my favorite blade, which I vacillate always something which I rather like the blue or the green now.
I find the green slightly sharper in shorter service life.
All beginners I recommend using the blade to experementieren and to try different brands and models, you can not say a flat rate here the blade XY is the best.
There are just several variables and ultimately one of the personal and subjective impression.
From me personally, there is an absolute recommendation for the green Astras.
And now for the price 10,90 euro for 100 blades I find absolutely fine, I get over 400 Astra blades for the price of 8 system razor blades.
How long to get there by 400 blades? I consume at 3-4 shaves per week depending on the 'mood' 2-3 blades per month recalculate, you are allowed now even. (With 2 blades per month, it would be over 16 years !!!)