I got problem like megaton underwater with ttw, but I had less detail about f3fnv, maybe the balance of ttw is better than f3fnv, or other things that ttw better f3fnv,  so I cannot decide use which.

I've never had problems like Megaton underwater with TTW, what I did get is a more stable game with less crashes and more fps with TTW, so I can't say anything bad about it. And the TTW interiors project from chucksteel plus the mojave express boxes in the capital wasteland... It's just amazing.

I've never tried f3nv because ttw is relatively complete, and it's the perfect game. I don't know when you last tried it out, but most of the bugs are fixed, and many problems come from other mods, which isn't much because most mods don't touch ttw.

Tale of Two wastelands hands down for me. It's more stable than the base fallout 3 game due to it using the new Vegas engine. And you can use mods that were made for new Vegas in fallout 3.

When i played Fallout 3 with Wanderer's Edition it would crash constantly on windows 7, but with Tale of Two Wastelands i can simulate Wanderer's Edition with Project Nevada with less issue's.

There is the one issue with Liberty Prime wanting to walk off his designated route and hunt down enclave troops from across the map due to Project Nevada, but i think RealRoyBatty or someone from the TTW team is working on it.

Hmm, I've been wondering which one I should use. Looks like TTW is the favorite around here so I guess that's the one.

TTW is mostly bug free and the bugs present are very easy to fix. If anyone needs help with installing TTW or fixing any bugs ask me I've been using it for years.

TTW is the absolute superior version, plus they've got another version in the works which has hundreds and hundreds of bug fixes and improvements. Megaton underwater is a problem with mods, not with TTW itself.

TTW was the first and will always be the best the one problem I do have with TTW is the radio seems to mess up as I don't use the default sound track.

There's a massive update for TTW coming soon, so plenty of bugs will be fixed for that version.

The Radio bug is known and it's being fixed

As someone that has tried both I guarantee that TTW is waaaaaaaay better.

F3FNV is simply full of bugs, it's just an import, plain and simple, no bug fixing of the sorts. There are a lot of things that don't work right, believe me.

TTW, althought the same, has a team that has been working on fixing a lot of issues since they made the mod. Not only that, but there are a vast amount of mods that have been converted and the installation is waaay simpler.

I would suggest trying both but if I remember correctly uninstalling F3FNV is close to impossible.

Oh god megaton in water even with a clean save

I've used F3FNV for about... 2 hours, with countless mesh, texture, audio and framerate problems.

I've been using TTW for about 2 months without any major issue what so ever.

I'd recommand TTW without a doubt.