I've played both classes, Let me give you the Prop's and Con's from both of them.
Sorcerer: (I'm lvl 120 Sorc well knowed in Gracia).
Pros:
- High HP/Mana (Without using full GTS)
- Most easy character to Farm and lvl (Including HH)
- High elemental res
- Good Damage dealer (You're abble to kill most of the classes)
- Halt and Requiem, best debuffs.
- DOT Debuff, (Decrease Movement and Attack speed, and deals 3.2k DMG each 2 seconds).
Cons:
- Medium Tanker (Sorc without GTS its an easy target for some chars like Ranger, Zerks)
- Party buff needed (At low lvl you are paper char and you have **** cast time)
- HH items cost expensive (As others says, Sorcs is a popular character, items cost alot.)
- Not good character against Rangers/Zerks.
- CC Eater (You'll need Lens and Combis untill you reach lvl 111, at that lvl you get your Cast buff)
- Low Physical resistance (You'll need best stones in items to reach 80%).
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Archer (I had my Archer lvl 106 in Gracia, well knowed too.)
Pros:
- Good damage (After you build him well)
- Best debuff dealer (Cast time, Elem res, Defense, Crit reduction)
- 8 Unblockeable skills
- DOT Debuff (Not 100% succes like Sorcerer but is good too.)
- HH items are cheap
- Insane movement speed.
- High cast time
- High Elemental/Phyisical resistance.
Cons:
- Low HP/MP
- Scions needed (You won't be abble to deal good damage using full ashtal, here you can see a test that i've made,

)
- Paper char against most of the classes.
- Mana eater (Skills cost too much Mana and Archer doesn't have good mana using full Scions).
If a Sorcerer do pvp against Archer, I'm not sure who will win, Chances are 50% for both classes, But my advice is, if you want an easy char, a good one, play Sorcerer, you'll feel totally comfortable playing him.
Just my opinion.