With a co-op, you pay a maintenance fee which includes your share of the property tax on the whole complex AND your share of the upkeep of the complex like trash removal, maintenance of the grounds etc. Roughly half of this monthly maintenance fee is tax deducible.
With a condo, you pay your taxes and common charge separately.
In both cases your mortgage interest is tax deducible.
As far as re-sale goes, if the price is right, the property will sell in a reasonable period of time and if you buy low and sell high, you will realize a profit regardless of whether it's a condo or a co-op.
If you are contemplating buying now, either choice will be a good one! Interest rates are low, prices are low as well and inflation is probably on the way so if you can lock yourself into a good rate now, you will fair much better than your friends who are renting!
You are correct that comparable properties, one a co-op and the other a condo, the condo will almost always be more expensive. Co-ops require a full financial disclosure and, usually, at least 10% down. Most co-ops are now requiring 20% down as the Private Mortgage Insurance companies are not granting insurance on loans with less than 10% down. Co-op boards also require certain minimum credit scores and debt to income ratios that make it harder for certain people to buy. These are a few of the reasons why condos might be more expensive. Basically, if you can get the loan, you can buy the condo. (There are exceptions to this of course!)
Please feel free to call me at 914-513-9811 if you would like further help with this. I am always working and will provide you with the attention and experience you deserve!