Gas or tankless? Wonder what the differences are?
I do not have a tankless water heater. I have gas. And I can tell you from my experience, I LOVE IT!! The water gets hot quickly and stays there for quite some time. We can run the dishwasher, the washing machine, and have a shower going all at once. It's nice.
I know someone with a tankless water heater. When they've visited my place, they comment about how hot my water is and how quickly it gets there. I also found out they were told that before they run their dishwasher, they have to run the kitchen faucet on hot first, in order to get hot water running for the dishwasher. Having gas, I do not need to do this.
So do your homework. Ask questions. Do research. Find out all you can about all your options before committing to one. That's the best advice I can give you. For some, tankless is the best option. For others, Gas is. Only you can answer what the best option for you is, once do you all your research. So don't be afraid to use google and talk to you PMs.