Thanks guys for the reply!
The main reason I want to buy telescope from Latvian sites is that they are offering to pay monthly for the product (and shipping for free).
There's no rush, so I would like to have common understanding of what's best from telescopes they are offering.
Question: Aperture is one of the most important factors to see deep sky objects? So therefore, Newtonian would be a better choice, right?
I have 4 other candidates.
1) https://www.gpspro.lv/products/lv/462/13790/sort/1/filter/0_0_0_0/OMEGON-Reflektora-teleskops-N-130-920-EQ-3-260x-teleskops.html
https://www.gpspro.lv/products/lv/462/13778/sort/1/filter/0_0_0_0/OMEGON-Reflektora-teleskops-N-130-920-EQ-2-260x-teleskops.html
The main difference for these looks like mount. EQ-2 and EQ-3.
2) https://www.gpspro.lv/products/lv/462/14686/sort/1/filter/0_0_0_0/SKY-WATCHER-Dobson-Reflektora-teleskops-N-150-1200-Skyliner-Classic-DOB-300X-teleskops.html
Dobsonian
3) https://www.skyhunters.lv/teleskopi/Ņūtona-Reflektora-Teleskops-Bresser-Pollux-SKY-150-1400-ar-EQ3-Montējumu/
This one looks really promising. Good discount and I even get smart phone adapter! Although there is "catadioptic system (integrated barlow lens)" and not sure if that makes calibration harder.