Are you choosing one of each class? or trying to decide on one character?
trying to decide between Divination Wizard and Tempest Cleric, actually.
The choice breaks down to:
Are you proactive? Scry, detect, portent. Divination will help solve mysteries and help either avoid conflict or be packing the right gear and spells for the threats you face.
Are you reactive? Maximized thunder and lightning damage, heavy armor and healing will bring the hurt and save your allies as a Tempest cleric.
Tempest Cleric all the way!
Str build options
Vhuman with HAM at level 1 with 16 Str, 14 Con, 16 Wis. Plate + shield 20 AC
Vhuman with Res(con) at level 1 with 16 Str, 14 Con, 16 Wis. Plate + shield 20 AC
Vhuman with Warcaster at level 1 16 Str, 14 Con, 16 Wis. Plate + shield 20 AC
Dex build options
Vhuman with Res(con) at level 1 with 16 Dex, 14 Con, 16 Wis. Half Plate + shield 19 AC
Vhuman with Defensive duelist at level 1 with 16 Dex, 14 Con, 16 Wis. Half Plate + shield 19 AC
Vhuman with Warcaster at level 1 16 Dex, 14 Con, 16 Wis. Half Plate + shield 19 AC
Hill Dwarf 14 Dex, 16 Con, 16 Wis. Plate + shield 20 AC + extra hit points
Wood Elf 16 Dex, 14 Con, 16 Wis. Half Plate + shield 19 AC
Either way you go, I'd probably bump Wis at 4 and 8. If I had to choose just 1 feat, I'd probably go Res(Con) since you can get it at level 1.
You can sit back and just blast if you want, but you'd get your money's worth by getting down into melee, even if you never even attack with your weapon.
Turn on Spirit Guardians, Spiritual Weapon, and sit down on the front lines and use your action for whatever you want whether it be attacking with your weapon, attacking with a spell, heal somebody, casting a utility spell, or just simply using the dodge action. You'll be a melee monster even with your one weapon attack. Lets count the d8s you'll be doing lol
2d8 with your weapon attack, 1d8 with your bonus action, 3d8 to every enemy within 15ft of you, and another 2d8 with your reaction if hit with an attack lol
Spirit guardians scales up pretty well 1d8 per up-cast so 5d8 from a 5th slot.
And then twice per fight, you can drop a maximized Shatter, Thunderwave, Call Lightning, etc....
Wow CTurbo! you always deliver man! =)
Awesome stuff!
Let me ask you, what are the main differences regarding STR build and DEX build?
If you have never played a caster before I recommend cleric. Clerics start out smoother than wizards IME.
Str builds get you +1 to AC, opens up more melee weapon options, but your initiative will take a hit. Dex builds take the -1 hit to AC, has more ranged weapon options, and has a much better initiative. Dex is generally more useful than Str. You'll want Athlete proficiency if Str, an Acrobatics proficiency if Dex either way.
My vhuman Tempest Cleric took HAM at level one and he was more more melee focused on purpose. I started Morningstar + Shield but when we found a +1 Greatsword, and nobody wanted it, I ditched the shield and used the +1 Greatsword lol. The HAM feat allowed me to take the AC hit. This is not the most optimized way to play of course, and I did not spam Spirit Guardians. I still ended up stealing the show most of the time anyway whether I was maximizing the damage or using my domain spells. In fact, every one of my domain spells had a encounter changing moment at one point or another.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.