You do realize the Ski-Doo Alpine and the Arctic Cat Pantera are two very different machines...? One of them being a work horse meant to pull heavy loads, the other one being kind of the luxury sports sled of those days...?
The 1988 Pantera is basically the same machine as the 1988 El Tigre, but equipped with little bit more luxury...I might be wrong, but I'm pretty sure part of the luxury with the Pantera was electric start as well as reverse. It definitely had a weird looking leather seat, where the El Tigre was little bit more performance oriented. I had a 1988 El Tigre around 1990 and it was basically performing on par with the Formula MX, but not as fast as the Formula Plus. Definitely faster than the Yamaha Phazer and SRV, but not as fast as the VMax and Exciter.
Also, you are asking about 36 year old machines. A lot of bad things can happen with miles and 36 years...I don't remember any particular dramas with a relatively new El Tigre. It came with bit of a weird clutching and it was running a lot stronger after getting that sorted out. It did un-thread an end eye off one of the front shock absorbers. But in general I would think about it as a reliable and strong runner back in the days.