OK, I am going to throw a grenade (I've posted on this subject many times) so apologies to the group ahead of time.
It does largely depend on what you need, and also whether you've ever used Quicken or even MS Money on the PC, but I have found Finance software on the Mac to be grossly lacking, and I have bought (not just tried) a lot of them, including iBank (2, 3, 4 and 5), MoneyWell, Money, Quicken Essentials, Quicken 2007 (last major Mac release), YNAB, MoneyWiz and SEE Finance.
If you're only interested in tracking checking accounts and maybe credit cards on a Mac, MoneyWiz and YNAB are really nice - Quicken Essentials is neat but expensive (if you can pick it up for $15 it's a better value).
If you really need Investment tracking, iBank or (amazingly) Quicken 2007 are really the only ones that integrate that into your entire financial picture in a usable way - but iBank's reports are awful, especially if you have a lot of accounts and its budgeting is a mess - even the latest version.
If you need budgeting, YNAB and MoneyWiz are nice. MoneyWell is probably the strongest, but you need to use envelope budgeting for it to make sense... and frankly, if you need all of the above, plus connectivity to obscure banks (like Capital One... can your hear the sarcasm dripping off this post?), or multiple currencies, you'll either need to pay iBank's hilarious $40 a year, or take one of Intuit's offerings.
Quicken is actually now the only reason I maintain a virtual machine, and ever since 2006 when I 'fully' switched, I have been waiting for something on the Mac side to meet or beat Quicken for Windows. Nothing has. But your needs might be simpler than mine - take me with a pinch of salt as this has been my Mac bugbear for 8 years.
But... there is light at the end of the tunnel. I can't really say much about it, but there is a NEW Quicken for Mac coming out; the true successor to Quicken 2007, which may very well trump everything out there now - that is, of course, if you want to give Intuit your money.
You can always use a platform-agnostic tool like Mint.com, which is free and can be used on any device.