Snow leopard or lion for MacBook 2.1?

I want to do an OS upgrade to my mid 2007 MacBook currently running  OS10.5.8. What is more appropriate, Snow Leopard or Lion? The only hardware upgrade I plan to do is RAM to 4 GB (3.3 available). Because of cost I don't want to upgrade to a SSD.
My question is will Lion run too slowly on my comuter with 4 GB RAM and no SSD (see specs below)? My current use for the MacBook are browsing, MS Office and similar, and streaming TV shows. I am considering Lion over SL because I read you can install the same aps as I put on my iPad Mini and iPhone 5.
Thanks for your opinions.
-Carol
Model Name: MacBook
Model Identifier: MacBook2,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 1 GB
Bus Speed: 667 MHz
Hard Drive: Upgraded to Hitachi HTS722010K9SA00 (Serial ATA-150, 7200 rpm, 10ms seek time, 16 MB buffer, 100 GB)
Video: Intel GMA 950 integrated graphics processor with 64 MB of DDR2 SDRAM shared with main memory
Pad: Scrolling TrackPad

Is your MS Office 2004 or 2008. 2004 will not run under Lion because it's a Power PC program. Lion doesn't run any Power PC programs. To see if you have any Power PC programs go to the Apple in the upper left corner and select About This Mac, then click on More Info. When System Profiler comes up select Applications under Software. Then look under Kind to see if any of your applications are listed as Power PC. Universal and Intel will run under Lion.
Before Mac switched to Intel processors in 2006 they used Power PC processors from 1994 to 2005. Power PC 601 through 604, G3, G4 and G5. Applications written for the Power PC processors need the application called Rosetta to run on Intel processors. This was part of the Operating System in 10.4 and 10.5 but was an optional install in 10.6. With 10.7 Lion Apple dropped all support for Power PC applications.

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