NFT I went with first, and to be fair its a doddle, only downsides or things not to do, dont buy the biggest res you can, i bought a square metre x metre GT100 100litre res first, but it was an arse come tank change, an arse to maintain, to get to the back plants, to clean, it was just too big, so i bought two GT424s which are 45 litre tanks and are basically the same as the GT100 when theyre placed side by side, and much easier to maintain, res change etc
Only downside with NFT is ive found is once the system is full of roots water circulation gets impeded and ive noticed i get a film on the top of the water during the last few weeks where the res and tray is rammed with roots, so i use an air stone to keep the water moving. With DWC the roots just hang into the bucket, i think DWC is less restrictive to the plants than NFT, thing with NFT is they get going faster because the rockwool blocks are sat on a tray with constant feed being washed over and around them, once the roots grow down into the tank, the tray becomes a kind of pointless feature other than for somewere for the blocks to sit, so after 3 - 4 weeks once the roots are in the res water, it kind of becomes a DWC system anyway.
Id personally go NFT or DWC for your first run, the only negative with DWC is unless you buy a proper system with the brain then youl have to empty each bucket individually as you can only grow one plant per bucket, where as NFT you can grow 2/3/4 etc at a time and only have to change one res
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