with Palau and liveaboards - you get what you pay for!
A liveaboard will give you 4 dives per day, no hauling gear, no rinsing gear, no waiting at restaurants, and no sitting on bouncing boat for 1-2 hours a day to get to and from dives.
A liveaboard will be anchored in a harbor with no boat motion at all, and only a 5-15 minute ride out to dive sites and back each dive. Between dives you will be eating onboard the boat, food will be served as soon as you arrive back from each dive. You get up, eat light breakfast, DIVE, eat hot breakfast, DIVE, eat hot lunch, DIVE, eat snack, DIVE, eat dinner... and can do a night dive after that most nights. REALLY... best bang for your buck. It is your option to skip any dives, also, and stay on the mothership while others go out on skiff. Your gear stays on skiff all week and tanks are filled there while you eat. On my liveaboard trip, we had a diver who had previous DCS experience, so she skipped every other dive in order to get longer surface intervals... no problem. She read and relaxed while we were off diving.
If you do land-based, you will get in 2 dives a day, maybe 3 at most and will need to go into town to find dinner each night. If that is more to your liking, then I see no reason not to do land-based.
robin