Liverpool want the final next Saturday; Spurs dont. Three weeks hands Spurs time to get players back. Three weeks gives Liverpool time to lose edge and focus and game tightness. Three weeks hands time for a ton of pressure to build on Liverpool to salvage their season.
I look at the two teams on paper and if Kane, Winks and Vertonghen are back I see an evenly matched encounter. Spurs v Liverpool in a league game usually ends with only a Liverpool win. Spurs in a cup final with the firepower they have (and the fact Liverpool have expectation on them and last years final defeat on their backs), I take them to beat Liverpool. I can see 2-1 or 3-2.