The best hikes in the Allgäu depend almost entirely on which of the five sub-regions you're exploring. Here's an honest comparison.
Oberstdorf and the Allgäu High Alps
Anyone searching for hiking in Oberstdorf usually means the Allgäu High Alps at their most concentrated: the Nebelhorn and Fellhorn, with cable cars offering a starting point for ridge walks; the long Oytal valley with a mountain inn at its far end; the Stillachtal and Trettachtal as quieter alternatives; the Breitachklamm as a spectacular option for bad weather; and several mountain lakes, of which the Seealpsee is the best known. On a hike from the Nebelhorn cable car above Oberstdorf, you start from the upper station at over 2,000 metres, with a panorama stretching deep into the Alps from your very first step. For multi-day hikers, Oberstdorf is the classic starting point: the Heilbronner Weg and the Oberstdorf hut circuit both begin here, as does the well-known Alpine crossing heading south. Compared with the Nagelfluh chain, Oberstdorf is rockier, higher and more demanding.
Nagelfluh chain and Hochgrat
The Nagelfluh chain is a long, grassy ridge running from Oberstaufen to Immenstadt, with the Hochgrat as its highest point. What sets it apart is openness rather than rock: on a clear day, you'll see Lake Constance on one side and the snow-capped high Alps on the other. The Nagelfluhkette Nature Park protects this landscape and the wildlife that roams here. The ridge is long enough for a walk of several hours, with plenty of short counter-ascents along the way. For hikers who want Alpine openness without venturing into high-mountain rocky terrain, the Nagelfluh chain is the first choice. Compared with Oberstdorf, it's considerably more accessible and less exposed.
The Hörner villages in the Oberallgäu
Fischen, Bolsterlang, Ofterschwang, Obermaiselstein and Balderschwang together make up the Hörner villages, an area of rounded grassy mountains, alpine farming and wide views over the pre-Alpine landscape. The Riedberger Horn is the best-known summit. The paths here are well marked, ascents are rarely exposed, and there's a working alpine hut waiting on almost every ridge. The Hörner villages are the top choice for beginners, families and anyone after a relaxed walking week without needing Alpine experience. Compared with the Nagelfluh chain, the routes here are somewhat shorter with less total ascent; compared with Oberstdorf, they lack the high-Alpine experience.
Ostallgäu: Füssen, Pfronten and the Tegelberg
In the Ostallgäu, the mountains combine with a strikingly dense lake landscape: the Forggensee, Alpsee and the lakes around Füssen all lie at the foot of the Tegelberg and Säuling. The Tegelberg is reachable by cable car and offers starting points for walks with the King's Castles as a backdrop. The Pfronten mountains, with the Breitenberg and Aggenstein, are somewhat more demanding and lead towards the Tannheimer Tal, which lies on the far side of the ridge in Tyrol. The Ostallgäu is a good choice for anyone wanting to combine mountain walks with lake scenery. Compared with Oberstdorf, the routes are shorter and less high-Alpine; compared with the Hörner villages, they're more varied thanks to the mix of mountain and lake.
Westallgäu: pre-Alpine country between Lindenberg and Scheidegg
The Westallgäu is the calmest face of the region: gentle hills, moorland, woods and the Scheidegg waterfalls as a natural highlight. On very clear days, the view extends as far as Lake Constance. Paths in the Westallgäu don't demand any Alpine fitness and suit relaxed day trips. Anyone looking for a base from which to walk both into the Allgäu and towards Lake Constance will find a good option here. Compared with all the other sub-regions, it entirely lacks a high-mountain character.