The differences between an attack helicopter and a fighter jet are too obvious to need an answer, and since my point has not been related to differences between individual aircraft but overall capability the answer hasn't been relevant. But if you want to compare differences in capability, here are the highlights of some current aircraft we have in service. I want you to tell me what NEW capability that F-35 is adding to this. The one and only thing I could identify is the air-to-ground capacity being higher for a stealth aircraft, but once you strap anything to the external hardpoints the stealth capability becomes moot.
So for the $1+ trillion dollar (and growing) price tag, what new capability are we providing the U.S. military? That question becomes more relavent when you consider sk8's point that actual NEW unmanned technologies are going to be qual'd before this pit even EOLs.
Aircraft Capability Armaments Performance
AH-64 Close Combat Attack, VTOL, Hover Anti-Armor, Covering Force, Escort 197 kts, Range 257 miles, Combat Radius: 260 miles
B-2 Stealth Bomber Internal up to 40,000 lbs Mach 1, Range: 6,000 miles
F-15 Multirole fighter Air-to-Air, Air-to-Surface, Bomber (up to 23,000 lbs) Mach 2.5, Range 1,600 miles, Combat Radius: 790 miles
F/A-18E/F Carrier-borne multirole fighter Air-to-Air, Air-to-Surface, Anti-Ship Mach 1.5, Range 1,100 miles, Combat Radius: 400 miles
F-22 Stealth, carrier-borne Air-to-Air, Air-to-Ground Internal 2x 1000 lbs or 4x 250 lbs, External 4x 5,000 lbs external Mach 2.2, Range 1,600 miles, Combat Radius: 450 miles
F-35 Stealth, carrier-borne, VTOL, Hover Air-to-Air, Air-to-Ground Internal 2x 3,000 lbs Extenal 2x 15,000 Mach 1.6, Range 1,200 miles, Combat Radius: 613 miles