you need large supply lines for gas tankless, and do check your
miinimum wanter water temperature, often incoming water can be very
cold.

tankless rarely save much because of their high initial cost, service
requirements, you need local service tech, and the warranty is never
more than 10 years.

newer regular tanks are foam insulated with nearly no standby losses
and very reliable requiring little or no service

if a gas tankless using electricity a power outage means no hot water
at all.........

standard tanks have enough hot water for at least a couple showers..

if you desire endless hot water get a 50 or 75 gallon regular high BTU
TANK. 75,000 BTU IS OVER TWICE a regulat 30K btu tank

regular tanks are pretty cheap tankless cost a fortune and
manufacturers require pro install for valid warranty...