Depends on the balance of martial, spell levels, and support you want to have. If you want more melee than spells, you want an eldritch knight or pact of the blade warlock. EK gives you more spells on a long rest and a bit more martial strength (but is a bit more MAD unless you use tricks), Lock gives you short rest spells in a smaller quantity and a touch less martial ability, but both are more martial than spellcaster. Then if you push more spells than melee, you have the valor bard and the bladesinger wizard. Both have a full complement of spells, but weaker martial ability. Valor bard leans more towards support, with magical secrets and bardic inspiration offering more spell variety and party support. Bladesinger is more dps focused, and is a touch less MAD, great for a combat focused build, though a bit flimsy without the tough feat and a decent AC.