Are we talking about a Persian contract 98/22, or just a Czech 98/22?
In either case, I'd say the 98/22 is the more valuable of the two. The Persian contract rifles in particular seem to be very esteemed amongst the multitudes of Mauser variants. T38's are decent rifles, but they tend to be very loose and very worn. Most of them were shot a lot and dragged through the sands and it shows. A lot of the T38 rifles are just Turkish re-arsenals of donated or contract German Mauser 98's and 93's, with original serials ground off and new barrels when necessary.
It's pretty hard these days to find a nice Gewehr 98 type long-rifle just as it came out of the factory for cheap, and comparing one of those to a similar quality T38 (matching numbers, good metal finish, good wood), I think the 98/22 would beat it handily in terms of value.