Go with Fibernet, its a better technology. In future, either prices will drop or data limit will be increased. Start with monthly billing plan, then see if you can spread data usage with annual billing option.
Friends am from kerala in my area local cable network provide ofc internet srevice. at first Rs2800 for wifi modem. and monthly 499 for 1mbps for 10gb and after 512kbps. is it a good option than bsnl