1. WILL shall be effective only AFTER death of WILL maker. Such WILL can be changed every week and is further challengable by other legal heirs. Hence unreliable.
2. Settlement Deed duly executed becomes effective immediately during life time of all the parties. Dead people cannot execute settlement deed and neither they can partake any benefit out of it.
3. Registered Settlement Deed executed mutually & jointly is legally Final & Irrefutable and non-revocable, more so since property would have passed to be beneficiary parties immediately.