The Leadtek card has a single-standard tuner, no advanced (dolby) stereo processing, fewer inputs, and the older tuner technology (the silicon tuner on the Lifeview is particularly good with weak signal stations). And it's not compatible with 3.3V PCI slots (this doesn't matter in standard desktop PCs).
I'm very surprised at the price for the Lifeview - newegg briefly had them for 40, and here in Germany I'm paying the equivalent of 35 and 40 USD for the versions without/with FM radio.
My personal experience with the obvious brands (Hauppauge, Pinnacle) is that while their cards are definitely fine, their software usually lacks the attention to detail beyond description - every time I tried, I found them to be incomplete, crashy, non-working in the less obvious functions. No fun, definitely not worth the premium you pay for a recognized brand name.
Leadtek's as well as Lifeview's software however haven't disappointed me so far. So if you got trouble obtaining the Lifeview for a reasonable price, that Leadtek card will do a fine job as well. From the photo, it's using the current Conexant main chip - that one's good in color depth and signal handling. Just stay away from the ancient BT878 or 848 chipset, that one's well past his best-before date (low color depth, bad contrast etc.)