If you only traded SPY options, would it make sense to go with the lowest commissions

[Cdntrader]

Quote from shooter:

Considering SPY is the most liquid and has the tightest spread, how much better can Interactive Brokers execution be compared with, say, MB Trading or eOption?

At MB Trading it looks like I can cut commission in half with a 50 contract trade in SPY. eOption even more. That being said, there is the issue of your money being safe, IB is probably the safest place for your money (excess margin and such). eOption doesn't have the greatest reviews in older elitetrader posts.

Any opinions? Again, this is specific to the SPY etf. Less liquid stocks/etf's, that's a different matter.

Wow MBT is that cheap? too bad they dont take Canadians or I'd open an account.

Anyways, I use IB and love them.

ES is not nearly as fluid and tight as the SPY. I trade both but prefer SPY generally.

 

[cdcaveman]

i trade ES, SPY, and SPX options.. Its more about position size to me.. thats more important to me.. I trade with IB and commissions are cheap as has been stated... if i'm going to calender spread i use SPX.. if i'm going for a 30 wide fly.. maybe ES .. a wider fly SPY... everything is measurable.. unless you quantify exactly how these SPY fills at such a lower notional value relate to SPX options considering the commiissions...
for me at IB 10 spy flys are 28 bucks!
so putting on a fly with SPX for 2.80 makes sense for me even considering the quote on quote bad fills.. Plus i let the market come to me and i position size small..