lets imagine a 9th level fighter... this is when they are are (by raw) the worst, they have not gotten there 3rd attack and they do not have much other then hp to speak of.
Okay so lets make a quick champion (RAW) the arrya is 15, 14, 13, 12, 10, and 8
So lets say I am a dex build... I will fight with a rapier(refluff as elven longsword) and longbow I am making a 2014phb half elf with the high elf (so I can get a cantrip) as my race.
So I am putting 10 into str 15 and +1 into dex 13 and +1 into con 8 into int 14 into wis and 12 into cha that gets +2
I get action surge and second wind each 1/sr indomintable 1/long rest
defensive figtingg style gives me +1 AC
I get 3 normal ASI plus your 2 feats
I am taking prestidigitation at will
I make 2 attacks per attack action and I crit on a 19+
I add half prof to str dex and can checks (including skills) that I don't add prof too...
I am going to up my dex to 18 with 1 ASI, take defensive duelist with another, then fey touched for detect magic and misty step each 1/ day and I get to boost my int to a 9.
Your two bonus are easy... lucky and shadow touched for invisability and disguise self and boosting that int to a 10.
So I end up with Str 10 Dex 18 Con 14 Int 10 Wis 14 CHa 14
1 cantrip at will 2 2nd level spells at 1/day 2 1st level spells at 1/day +1 to my AC add prof to 1 hit as reaction as well 3 luck pts for rerolls 1 indomitable for rerolls and action surge and second wind.... I have 9d10HD so about 70hp most likely an AC 18 with +4 against 1 target as a reaction.
I attack twice with a 1d8+4 and attack with a +8 to hit.
now lets make a hexblade warlorck.
also a half elf, this time no house rule boosts
at level 9 I have 2 5th level spell slots (short rest) 9 spells kknown between 1st and 5th I have 2 attacks for 1d8+5 and my attacks are at +9 my save DCs are also at 17 and my AC is 17 and my HD is 9d8
its much closer then I thought...