Difference in converted weeks vs original points

I'm sorry if this has been covered elsewhere but I can't find "where".
Is there a usage difference in buying straight points vs points that come from a converted week? In TUG and on eBay I see X number of points that come from a specified week at some resort. Is there a reason that the week is given in the sales description? and is something timesharewise that I can or cannot do with the converted points?
Thanks for the collected TUG wisdom - I've learned a lot from these fora and hope to learn more.

For a converted week, Advance Reservation Priority is only for the underlying week on the deed. For a straight points contract, you get 13 months out at your home resort for any time of the year.

There might be a big difference in maintenance fees as well. Some Kingsgate converted weeks have very cheap MFs, while other contracts are quite expensive.

Thanks for the responses - they give me a better idea of what to look for as I buy (resale, of course).

Yes, there are DEALs in converted fixed weeks and some very BAD deals.

I own multiple converted fixed weeks - some times it pays off ... I recently took a converted fixed week which did NOT rent (as the underlining deeded week), cancelled the reservation booked it with my VIP discount and was able to rent it for less than the fixed week MFs ... of course, I had to pay for a GC - plus was I now had a few more points to use on another reservation.

Older ownerships where the person brought the fixed week from the resort - then converted to points - those points ADDED into their VIP level. So a developer purchase (203K in new points, converting an prior brought direct Wyndham F/W (154K) (cheap deal when buying points ) plus a PIC conversion (a 154K 2/2 Prime/Red RCI unit) would have meant GOLD VIP --- at the old 500K standard.

Other converted fixed weeks cost me in MFs per 1k of points, $4.25 .... no, I am NOT telling where. Some I want the ARP - then, I try to crystal ball: should I keep in points; should I not keep it in points.

One other difference: converted fixed week owners pay MFs one year prior. Points owners pay MFs during the use year. I have a converted fixed week at Sea Gardens, and I am currently paying the MFs for the January 2016 use year. This only really matters when you are buying or selling, and a lot of people just ignore it, so it might not come up.