i have stayed at both and i have to say i would pick desert inn over del sol any day. I haven't stayed at desert inn since 2008 but it was very basic...nothing special.. but perfect for the type of room we needed. We don't spend much time in the hotel so it was basically for sleeping only. The pool ...looked disgusting. we never used it but it didn't look very inviting.
the del sol was BAD. it's a cheap motel and it feels like a cheap motel. we stayed there in may of 2009 and decided never to stay there again. there were stains allll over the floor of our room. Because of this we went down to the lobby and switched into another one asap. during the trip we encountered many problems.
A list :
1. Our neighbors (or so we thought

) constantly jiggled the door nob on the door connecting our rooms... it happened every night around 2 am waking us all up. In the mornings we would walk by on our way to the park and the curtains were wide open and not a trace of luggage in the room. Don't know who was doing that but we did NOT like it
2. the shower head was WAY too low. I am 5'7 and had to bend down! my 5'5 cousin had to as well.. it was crazy and it wasn't adjustable.
3. Speaking of showers.... the water temperature was insane. you could only get a luke warm.
4. two of us got locked in the bathroom. the door spazzed and the door nob was turning but the door wasnt opening. for me to finally open the door took about 4 minutes ... which even though not that long freaked me out. the bathroom is tiny with just a toilet and shower and no ventilation. complete claustrophobia right there.
5. the parking is terrible. we have an suv and had one heck of a time getting into the parking space and back out of it.
Overall ...it was NOT an enjoyable experience. We didn't have any of those problems at desert inn! I know my review is based on a stay almost 2 years ago ... but incase things haven't changed ..I wanted to warn you!