Could you please recommend what s better- mechanical tools or hydraulic tools?

All tools have their advantages. A lot also depends on the circumstances of use and frequency of operations. For example, you can you mechanical tools at any weather conditions. Hydraulic tools can be used in temperatures between -15 up to +50 °С. Mechanical tools do not demand so much maintenance like hydraulic tools. Sometimes it is easier and quicker to crimp a lug with a single handles closure of a mechanical tool. Hydraulic tools are better and more comfortable when you do a lot of regular operations, as the user does not apply too many efforts. The pressure release valve in hydraulic tools saves the tool from possible damage. It is better to make your choice basing on your particular needs and conditions.