Usually guessable. MTK is mediatek. Tegra is Nvidia. GSMArena usually has the best details when it comes to specifications.
Also. Do not give too much consideration on configuration alone. A dual core phone from a good company could be a smarter purchase than a quad core phone from a crappy company. Similarly, a good dual core processor would be more powerful than a crappy quad core processor.
Make your choice... What do you want?
Best possible hardware for money?
Better customer support?
Good history with software updates?
Overall performance and user experience?
Also. Do not give too much consideration on configuration alone. A dual core phone from a good company could be a smarter purchase than a quad core phone from a crappy company. Similarly, a good dual core processor would be more powerful than a crappy quad core processor.
Make your choice... What do you want?
Best possible hardware for money?
Better customer support?
Good history with software updates?
Overall performance and user experience?