i think tech are harder because u need to get lumber and gold to produce units, but with magic, most of the units only needed gold to produce, but tech, you need to spend alot of gold and lumber in order to produce some units, for magic, there are like 2 stages of production, stage one, initates, and summoners, u can upgrade them to have the initates to become batlemages then up again to become arch mages, which is easier to use, and for the summoners, you can upgrade them to become drake riders, which is fast at speed. but for the tech, only the swordmans can be upgraded, besides the technicans, also, the mages are almost all long distance attacks which makes then stand a better chance to survive, and for techs, you need to produce cows/ pigs to keep the units production, but for magic, you only need to build energysource, and one energy source can give you 14 spaces for more units,but for techs, pigs only gives 5 and cows only gives 10 and the farm give 9, that is far below the magic side!
hope this helps