iTel, Tecno and Infinix are subsidiaries of same company, Infinix being the top brand and iTel the low end one, tecno lies somewhere between, if it's a native Tecno phone quality would be like itel, if it's a model based on an infinix phone with tecno branding on outer shell + software quality is somewhat better.
Below 25k, go for a vivo/oppo/realme phone whichever has better specs/design, for a facebook+whatsapp phone they'll be reliable,
above that (25k-35k range) infinix and tecno can get you somewhat better performing chipset, fair enough quality and next storage tier, which is good if the intended use includes gaming.
Above 35k, again go for Mi, Vivo, Realme or Oppo phones.