current is no issue,rpm will be 5400(WD) & 5900(seagate) but they are faster than your usual 5400rpm laptop hdd because of their special design.Longevity is random with hdd,better spread the risk & get 2 4TB WD & 2 4TB seagate.
Buy Online | Western Digital 4TB 3.5″ 5400 RPM Desktop Internal Hard Drive WD40EZRZ | Price in India
Buy Online | Seagate BarraCuda ST4000DM004 4TB 3.5" Hard Drive | Price in India
For read write speeds you can check any no. of youtube reviews but realistically speaking expect ~70-100MB/s sequential read write speeds initially which will drop with the filling of hdd.For video editing & encoding cpu & ram also matters significantly so it becomes a question of whether hdd speed is slower or faster than the rate at which your cpu & ram are working.If you use some very high quality setting for encoding on a not so fast processor then hdd speeds won't matter because your cpu will be the bottleneck.For video editing & photoshop I think using large amount of ram can somewhat reduce the impact of low hdd speeds.You can always buy a 250gb samsung 860 evo ssd for ~5.6k later if not satisfied with performance.